Pokémon Red and Green beta

This article lists the development leftovers and unused content of the Japanese and English Generation I games , , and that have been documented by fans.
==Global information==
===Pre-release===
====No Mew present====
According to the interview by Satoru Iwata with Tsunekazu Ishihara and Shigeki Morimoto about the release of , localized as Iwata Asks, they admitted that after the tools were removed, they added in the remaining space on the . Nintendo thought that this would have been risky because altering the internal data after completing the testing period meant that any new and/or es created by adding data without recurring to debugging tools would have been much harder to fix. Standard practices usually discourage altering the and not testing it just before releasing the to the customer.Iwata Asks - Pokémon HeartGold Version & SoulSilver Version
====Poké Balls====
Some concept art depicts Poké Balls on the ground, in two pieces. This is most likely just a carryover from when Pokémon was still the concept of Capsule Monsters. Strangely, the original Poké Ball sprites from lack the button in the center of the Poké Ball.
====Rebattling Trainers====
In an interview with Shōko Nakagawa in her book Shōko Nakagawa: Pokémon Taught Me The Meaning of Life, Tsunekazu Ishihara revealed that originally, the game was programmed to trigger a battle with each Trainer any time the player walked by them, regardless if the player had already defeated them in battle previously. The wild Pokémon encounter rate was also significantly higher originally. The Trainer rebattling was omitted from the final release and the wild Pokémon encounter rate was significantly reduced.Dogasu's Backpack: Nakagawa Shouko "Pokemon Taught Me the Meaning of Life"
====Release date====
The games were originally scheduled for a December 21, 1995 release, according to an old Nintendo of Japan flyer.すばらしきポケットモンスター赤緑（表側）の広告 This could explain the copyright year of 1995 that appears in the games' introductory sequence, and all subsequent games and official merchandise.
====Prerelease border====
On page 153 of the December 1995 book New Game Design by Game Freak is a summary of 's final plot. Two screenshots of the game are shown which use an unseen border resembling a Super Game Boy border. In it, "POCKET MONSTERS!" is written in a different size. The border has more Pokémon on it than the Super Game Boy borders from the final game. and are included, suggesting the screenshot may be from Japanese Red. does not appear in the border.
NGD border 2.png|Title screen screenshot from New Game Design.
NGD border 1.png|Battle screen screenshot from New Game Design.
Japanese RedTitle SGB.png|Final game's Super Game Boy border for comparison.
===Post-release===
====Concept art====
During a gaming exhibition called , early concept art of Capsule Monsters by Ken Sugimori was featured, along with pre-release material from . The concept art depicts rough versions of various concepts that made it into the final releases of the Generation I games. They seem to include various s, the , riding on a , a , Celadon City, Silph Co., and a town with a fountain which could have been reworked into Celadon City. Some other are identifiable in a raw or semi-normal form, such as , and others are prototypical of an entire class of Pokémon, such as a basic .
====GameCenter CX====
A Japan-exclusive special Pokémon episode of , known as Retro Game Master outside of Japan, included an interview with Satoshi Tajiri, where he revealed early character profiles of , and . Notably, they are given a National Pokédex number which matches their internal index number, rather than their final Kanto Pokédex number. Nidoking, for instance is noted as being #007, rather than #034, either suggesting that there was another method of ordering the Pokémon proposed, or that they reflect their ordering in the internal data. The latter is supported by interviews with Ken Sugimori, which verify that , which has an index number of 001, was the first Pokémon ever created, and early sketches from Capsule Monsters featuring Rhydon. Nidoking is also referred to as マイコー♂ Maikō♂, indicating that there were either placeholder or alternate names for Pokémon before the development of had finished.
====Professor Oak battle====
Unused Trainer data for Prof. Oak (Japanese: Teacher Oak) exists in all Generation I games.
Prof. Oak has data for three different teams using different first partner Pokémon, with each Pokémon being lv66-70, higher than 's Champion battle team. It is possible he was meant to be a late-game opponent, perhaps similar to in Generation II.
He can be battled by exploiting certain glitches.
====Bird type====
The type may have been a prototype for the type. This can be seen in the final releases: MissingNo. is recognized as a dual-type . The Bird type is present in the internal data of the Generation II games, possibly due to their engine being an upgraded version of that of the Generation I games.
====Directions====
Unused text strings within the game show option dialogs for <sc>North</sc>/<sc>West</sc> (Japanese: きた/にし North/West), <sc>North</sc>/<sc>East</sc> (Japanese: きた/ひがし North/East), and <sc>South</sc>/<sc>East</sc> (Japanese: みなみ/ひがし South/East). These do not appear in the final release, with the only in-game option dialogs being <sc>Yes</sc>/<sc>No</sc> (Japanese: はい/いいえ Yes/No) and <sc>Heal</sc>/<sc>Cancel</sc> (Japanese: あずける/やめる Heal/Cancel).Official 1st Gen (Red/Blue and Yellow) Glitch DiscussionPokémon Red and Blue - The Cutting Room Floor (For unknown reasons, there is no unused <sc>South</sc>/<sc>West</sc> (Japanese: みなみ/にし South/West) option dialog.)
====Unused Trainer class====
A Trainer class known as (Japanese: シルフのチーフ Silph's Chief) was omitted from the final releases, though like Professor Oak, a with an NPC with this data can be accessed through modification of the internal data or saved game data as well by cheating. It is apparently mentioned in-game by one of the s in Celadon City, and shares its battle sprite with the Trainer class since its index number of 0xE3 precedes it (Scientist's is 0xE4). He has no defined roster, instead using the one for the first Scientist on the internal list. Also like Professor Oak, he has no preset dialogues programmed in either for before the battle or after defeating him.
Its Japanese name suggests that the President of Silph Co. was originally planned as a that could be challenged to battle.
====Unused Trainer actions====
There is unused data within the games for trainers to use various items that goes unused.Pokémon Red Disassembly Project
====Extra field move====
An extra field move might have been planned as there is an unused entry between and within the internal data. It could also have been an HM as it is placed between the aforementioned HM02 and HM03 and all HMs are ordered by number in the internal data. Given its index number of 0xB4 and that the highest index number used for actual moves is 0xA5, other moves beyond the 165 introduced in Generation I were once planned as well.
The unused text string "Ground rose up somewhere!" (Japanese: どこかでじめんがもりあがった！) might be related to this scrapped field move.R/B Outside Battle Moves (Page 1) / Generation I / Skeetendo
====Music====
An unused track has been discovered in the internal data. The music is originally high-pitched and incomplete as only the individual audio channels are left. There have also been attempts at recreating what the full theme would sound like.
;Original music:
;Recreation attempt:
====Locations====
There are three map locations which are each identical to another map used in the final releases, except for the fact that the default theme used in the alternative location is different.Alternative map locations (Generation I) - Glitch City Laboratories
* The house invaded by Team Rocket in Cerulean City: has index number 0x45 instead of 0x3E and plays Caves of Mt. Moon
* The 's entrance at : has index number 0x4B instead of 0x4A and plays Vermilion City Theme
* The Poké Mart at Cinnabar Island: has index number 0xAD instead of 0xAC and plays Cinnabar Island Theme
In addition, 25 deleted map locations with leftover header data are present in the internal list of location index numbers.
* Three use the map header (index numbers 0x69-0x6B)
* 17 use the Pokémon League map header (index numbers 0x6D-0x70, 0x71-0x75 and 0xED-0xF4)
* One uses the Pokémon Tower map header (index number 0x94).
* Three use the Rocket Hideout map header (index numbers 0xCC-0xCE).
* Another uses the Rock Tunnel map header (index number 0xE7).
Formatted data exists for an additional map location.Unused town - Glitch City Laboratories It is located straight after the final town in memory (Saffron City) but just before . Its associated data is completely blank, even its header data and coordinates on the Town Map (as it is set as being part of Pallet Town, with coordinates (0,0)), except for the fact that an unused flag when checked allows the to to it. Attempting to travel to this location simply freezes the games.
There is an unused warp tile in Celadon City.Did Celadon City have an unused building? It is internally programmed in to lead to 5F of Celadon Dept. Store, which in turn has its internal data located away from the data for the other floors, possibly suggesting that it was originally a completely different map in earlier stages of development, which is supported by the aforementioned discovery.
A part of the internal data relates to a Poké Mart placed between the data for the and Cinnabar Poké Marts and may be associated with the formatted map location as mentioned above. The item list contains Great Balls, s, s, s and s.
====Items====
Regularly unobtainable Key Items with the names of all the Badges exist in the internal data (index numbers 0x15-0x1C). This could mean that the Badges were originally going to be items that were carried in the 's Bag; however, as Key Items, they appear to be actually used in the list of Badges presented by the Gym Badge man in Cerulean City.Pokemon Yellow "Save Abuse" Glitch The BoulderBadge (index number 0x15) and CascadeBadge (index number 0x16) are the only ones that do something when used in —they allow the player to throw and Rocks, respectively, as in the battles. When used in the overworld (except dungeons and caves), it changes the background music to a single channel of Guidance; if used in a dungeon or cave, it changes the background music to a single channel of ～オープニング～ ~Opening~. This is due to the function that plays the "throw Bait or Rock" sound effect attempting to load it but referring to the wrong soundbank.
Key Item ????? (index number 0x07) enables the to without using a . Badges are not required either. Due to this ability, it is often referred to as Surfboard. In the final releases, the move Surf can be used by a Pokémon as a field move serving the same function. It may indicate that Surf was not originally implemented as a field move or that this is a debugging item used by the programmers. Unlike the move Surf, it also allows surfing on 's Cycling Road and does not trigger the "Cycling is fun! Forget <sc>Surf</sc>ing!" (Japanese: せっかくのサイクリング！⋯⋯なみのりはやめとこう) message.
The Pokédex is also present as a Key Item with index number 0x09 and can be accessed during battle, much like does in . It also causes the to load the overworld tileset and turns the HP bar to letters when used in battle.
 is programmed in as regular inventory item, having index number 0x3B. It cannot be used for slot machines or price exchanges, rendering it completely unusable. It will stack if multiple Coins are obtained; however, it is not stored by the Coin Case. It can be sold for 5 each at any Poké Mart and bought for 10 each from a Poké Mart with a modified item list. Actual Coin Case-stored Coins are available for double the price, at 20 per Coin, and cannot be sold. In the Trainer's Guide (manual) of , it is listed as a "miscellaneous item"; thus, it is the only item to be included in this category.Beta Red/Blue screenshots from the manual
TMs 51-55 (index numbers 0xFB-0xFF) were planned and contain each HM's respective field move by order. They stack as any other TM and can be sold at Poké Marts.
* TM51 teaches like HM01; can be sold for 1500 and bought for 3000
* TM52 teaches like HM02; can be sold for 7000 and bought for 14000
* TM53 teaches like HM03; can be sold and/or bought for 0
* TM54 teaches like HM04; can be sold for 4000 and bought for 8000
* TM55 teaches like HM05; can be sold for 2000 and bought for 4000. Also appears as <sc>Cancel</sc> (Japanese: やめる Cancel) and hides items below it; this secondary effect might be due to its index number (0xFF), which puts it at the bottom of the item list in the internal data.
Another Key Item named ????? (index number 0x2C) and a fake (index number 0x32) exist and are completely useless. The fake PP Up can be sold for 4900 and bought for 9800, unlike the real PP Up, which is sold and/or bought for 0.
====Sprites====
Different front sprites of were planned for , notably the ones for , , , and . These were featured in the November 1996 issue of , which published general information about the game.2012-06-01 - ポケモンのおっさん
====Cries====
Certain MissingNo. use specific leftover cries.Missing Number
* Cries with index numbers 0x43 (Base 0, Pitch 128, Length 16), 0x45 (Base 29, Pitch 244, Length 64), and 0x4F (Base 34, Pitch 255, Length 64) do not appear to resemble the cry of any actual .
* Cry with index number 0x51 (Base 14, Pitch 224, Length 96) resembles 's cry, cries 0x5E (Base 15, Pitch 64, Length 192) and 0x89 (Base 15, Pitch 64, Length 128) resemble 's; cry 0x5F (Base 15, Pitch 32, Length 192) resembles 's and cry 0x7F (Base 17, Pitch 32, Length 16) resembles either 's, 's or 's cries.
* Cry with index number 0xB5 (Base 29, Pitch 0, Length 128) is modified from 's but resembles 's, suggesting that the Pokémon might have been originally planned for Generation I instead of Generation II.
====Text====
Unused text strings referring to Badges and titles exist in the Japanese versions, but were not translated for the localizations. The katakana used for the (loanword) of "badge" is also slightly different, being バッヂ Baddji instead of バッジ Bajji. These names appear in the internal item list of the Japanese versions on offsets 0x4A92-0x4B08, which would suggest that they are items; however, they do not have valid effects if they are forcedly used as items. The most likely scenario is that these names originally belonged to different multiple lists.
* かみなりバッヂ Lightning Badge
** Not to be confused with the , which is named オレンジバッジ Orange Badge in Japanese.
* かいがらバッヂ Shell Badge
* おじぞうバッヂ Jizo Badge
** A possible reference to the Japanese variation of , known as Jizo.
* はやぶさバッヂ Falcon Badge
* ひんやりバッヂ Cool Badge
* なかよしバッヂ Friendship Badge
* バラバッヂ Rose Badge
* ひのたまバッヂ Fireball Badge
* ゴールドバッヂ Gold Badge
** ゴールドバッジ Gold Badge is actually the Japanese name of the .
* たまご Egg
* ひよこ Chick
* ブロンズ Bronze
* シルバー Silver
* ゴールド Gold
* プチキャプテン Little Captain
* キャプテン Captain
* プチマスタ Little Master
* マスター Master
====Default player and rival names====
The unused default name for Red in the English versions is <sc>Ninten</sc> while 's is <sc></sc>. While it is impossible to view these names during regular gameplay, changing a few es in can allow for these names to appear as shown here. This references the fact that in the years surrounding the releases of the Generation I games, Sony was Nintendo's main competition. Ninten is also the default name of the main protagonist of , a game developed by Creatures, Inc., which has worked on the Pokémon games since the start.
In the Japanese versions, the unused default names for Red and Blue differ between and :Default names
* In Pokémon Red and Green, Red's unused default name is やまぐち Yamaguchi while Blue's is いしはら Ishihara. Yamaguchi refers to Wataru Yamaguchi, an art director that worked on the original games, while Ishihara refers to Tsunekazu Ishihara, the current president and of The Pokémon Company and who was the games' producer at the time.
* In Pokémon Blue, the unused default names for Red and Blue are, respectively, ゲーフリ Gēfuri, an abbreviation of Game Freak's name in Japanese (ゲームフリーク Gēmu Furīku), and クリチャ Kuricha, a reference to Creatures, Inc.
====Unused in-game trade====
A -for- in-game trade was originally planned.In-game Trades The Beedrill's nickname in is ピピん Pipin and チクチク Chikuchiku in . This explains why the international releases contain unused text strings referring to a Beedrill nicknamed <sc>Chikuchiku</sc>.
====Safari Zone hidden PCs====
Unused coding leftover in the game shows that three specific house maps (DF, E0, and E1) contain data for Pokémon Center PCs in the same location PCs would be located in a Pokémon Center. checks where the last location of a Pokémon Center was and if it sees that it was a Safari Zone rest house, will not teleport you to that location. The invisible PC data was later removed in releases.Safari Zone Data
====Unobtainable Nugget in Safari Zone entrance====
If the Itemfinder is used at the Safari Zone entrance, it will say an item is nearby but it cannot be obtained without cheating.
====Unused Elite Four walking sprites====
There is sprites for the four members of the Elite Four walking but as they all stand still, the sprites never get to be seen.Elite Four Walking Sprites
====Super-effective Dragon type====
The type is super effective against itself in Generation I. However, due to the only Dragon-type move, , always dealing exactly 40 damage, this behavior never gets to be seen.
====Unused move effects====
There are unused effects for moves, the only effect to go used is 23 as the effect was assigned to in the original Pokémon Red and Green.
{| cellspacing="0" cellpadding="0" class="multicol" style="background:transparent; width:100%"
ID	Effect
01	Puts enemy to sleep.
0C	Raises Speed by 1 stage.
0E	Raises Accuracy by 1 stage.
15	Lowers Special by 1 stage.
17	Lowers Evasion by 1 stage.
1E	Attacks for 2-5 turns.
23	30.1% chance of freezing the opponent.
36	Raises Accuracy by 2 stages. (probability=hit chance)
37	Raises Evasion by 2 stages. (probability=hit chance)
3A	Lowers Attack by 2 stages. (probability=hit chance)
3C	Lowers Speed by 2 stages. (probability=hit chance)
3D	Lowers Special by 2 stages. (probability=hit chance)
3E	Lowers Accuracy by 2 stages. (probability=hit chance)
3F	Lowers Evasion by 2 stages. (probability=hit chance)
48	10.2% chance of lowering Accuracy by 1 stage.
49	10.2% chance of lowering Evasion by 1 stage.
4A	10.2% chance of lowering a non-existent glitch stat by 1 stage, no effect.
4B	10.2% chance of lowering a non-existent glitch stat by 1 stage, no effect.
4E	None.
====Unused Trainer parties====
There are a number of Trainers with teams that are never referred to or called on in the game data that are leftover.Trainer Parties
{| cellspacing="0" cellpadding="0" class="multicol" style="background:transparent; width:100%"
Trainer Class	Roster ID	Party Level	Pokémon
 	0D 	17 	Spearow, Rattata, Rattata, Spearow
 	0C 	18 	Metapod, Caterpie, Venonat
 	06 	18 	Diglett, Diglett, Sandshrew
 	04 	22 	Bulbasaur
 	07 	22 	Koffing, Magnemite, Weezing
Super Nerd 	07 	20 	Magnemite, Magnemite, Koffing, Magnemite
Super Nerd 	08 	24 	Magnemite, Voltorb
 	01 	29 	Growlithe, Vulpix
Burglar 	02 	33 	Growlithe
Burglar 	03 	28 	Vulpix, Charmander, Ponyta
 	01 	21 	Voltorb, Magnemite
 	06 	22 	Onix, Geodude, Graveler
 	0B 	33 	Weepinbell, Bellsprout, Weepinbell
 	06 	33 	Hypno
 	06 	42 	Rhyhorn, Primeape, Arbok, Tauros
 	0C 	39 	Pidgeotto, Pidgeotto, Pidgey, Pidgeotto
Bird Keeper 	0D 	42 	Farfetch'd, Fearow
 	01 	34 	Koffing, Voltorb
 	16 	26 	Drowzee, Koffing
 	OD 	17 	Spearow, Rattata, Rattata, Spearow
 	04 	45 	Kingler, Starmie
Cooltrainer 	06 	44 	Ivysaur, Wartortle, Charmeleon
Cooltrainer 	07 	49 	Nidoking
Cooltrainer 	08 	44 	Kingler, Cloyster
 	04 	46 	Vileplume, Butterfree
Cooltrainer♀ 	06 	45 	Ivysaur, Venusaur
Cooltrainer♀ 	07 	45 	Nidorina, Nidoqueen
Cooltrainer♀ 	08 	43 	Persian, Ninetales, Raichu
 	04 	48 	Primeape
 	01 	22 	Gastly
Channeler 	02 	24 	Gastly
Channeler 	03 	23 	Gastly, Gastly
Channeler 	04 	24 	Gastly
Channeler 	07 	24 	Haunter
Channeler 	0B 	24 	Gastly
Channeler 	0D 	24 	Gastly
Channeler 	0F 	24 	Gastly
Interestingly, one of the leftover Trainers found his way to the remakes. The originally-unused Engineer appears in the Vermilion Gym in Generation III, under the name of Baily. He uses the same Pokémon team as the unused Trainer and replaces the that stood in the same place in the original games. His placement in the game's internal data also matches the original unused Trainer.
==Localization-specific information==
===Pre-release===
====Pokémon names====
During the promotional period that preceded the English release of both and , a large amount of were shown with different names from those they had in the final releases. Some of these names were similar to their final names, but some were quite close to their Japanese names, and others were completely different from any current Pokémon name.
In addition to promotional materials distributed before the games' English releases, the book Pokémon Trainer's Survival Guide, one of the earliest player's guides available in North America, erroneously refers to Haunter as Spectre, its pre-release name.
# 	 	Final name	Early name 	Japanese name
006	 	 	Charizr 	Lizardon
010	 	 	 	Caterpie
014	 	 	Kokoon 	Cocoon
015	 	 	Beedril 	Spear
016	 	 	Pidge 	Poppo
018	 	 	Pidgeott 	Pigeot
019	 	 	Rattatak 	Koratta
023	 	 	/Arbo 	Arbo
024	 	 	Nagaasp 	Arbok
028	 	 	Sandstorm 	Sandpan
035	 	 	Aria 	Pippi
036	 	 	Ariala 	Pixy
037	 	 	Foxfire 	Rokon
038	 	 	/Nine Tales 	Kyukon
039	 	 	Pudding 	Purin
040	 	 	Custard 	Pukurin
043	 	 	Ladish 	Nazonokusa
046	 	 	Parasyte 	Paras
050	 	 	Digda 	Digda
058	 	 	Flamie 	Gardie
059	 	 	Blaze 	Windie
060	 	 	Aqua 	Nyoromo
061	 	 	/Polihirl 	Nyorozo
062	 	 	 	Nyorobon
063	 	 	Hocus 	Casey
064	 	 	Pocus 	Yungerer
066	 	 	Karate/Kara-tee 	Wanriky
067	 	 	Kungfo/Kung-foo 	Goriky
068	 	 	Judoh/Ju-doh 	Kairiky
072	 	 	Jilly 	Menokurage
073	 	 	Manowar/Man O War	Dokukurage
078	 	 	Gallop 	Gallop
079	 	 	Slowmo 	Yadon
081	 	 	Coil 	Coil
082	 	 	Recoil 	Rarecoil
083	 	 	Fowler 	Kamonegi
084	 	 	Dodo 	Dodo
087	 	 	Manaty 	Jugon
092	 	 	Spirit 	Ghos
093	 	 	Spectre 	Ghost
094	 	 	Phantom 	Gangar
096	 	 	Sleeper 	Sleep
099	 	 	Kingle 	Kingler
102	 	 	 	Tamatama
103	 	 	 	Nassy
104	 	 	Orphon 	Karakara
105	 	 	Guardia 	Garagara
106	 	 	Lee 	Sawamular
107	 	 	Chan 	Ebiwalar
108	 	 	Tonguetyd 	Beroringa
109	 	 	Ny 	Dogars
110	 	 	La 	Matadogas
113	 	 	Lucky 	Lucky
114	 	 	Medusa/Meduza 	Monjara
118	 	 	Goldy 	Tosakinto
119	 	 	Neptune 	Azumao
122	 	 	Mrmime 	Barrierd
123	 	 	Stryke 	Strike
130	 	 	Skulkraken 	Gyarados
131	 	 	Ness 	Laplace
132	 	 	Morpho 	Metamon
133	 	 	Eon 	Eievui
137	 	 	Poregon 	Porygon
138	 	 	Ess 	Omnite
139	 	 	Kargo 	Omstar
140	 	 	Att 	Kabuto
141	 	 	Lantis 	Kabutops
142	 	 	Ptera 	Ptera
147	 	 	Dragoon 	Miniryu
148	 	 	Dragyn 	Hakuryu
====Text====
Before the English releases of , screenshots were released of a with the where the text string "The <sc>Blue</sc> wants to fight!" was used. While this text would work with a typical , such as "The <sc>Lass</sc> wants to fight!" or "The <sc>Hiker</sc> wants to fight!", as they were not given personal names until Generation II, it would cause problems with Gym Leader, Elite Four, rival, and link battles, leaving them to end up as "The <sc>Misty</sc> wants to fight!" or "The <sc>Lance</sc> wants to fight!", as these Trainers did not at the time have titles, only their names. Because of this, the The was dropped in the final releases, leading to the somewhat odd sentence style in Generations I and of:
* "{Trainer's class or name} wants to fight!"
* "{Trainer's class and name} wants to battle!"
A screenshot in the instruction manual of English Red and Blue still contains the text "The <sc>Brock</sc> wants to fight!", possibly suggesting a late removal. The instruction manual also mentions Pokémon Leaders instead of Gym Leaders.
A slightly different grammar was also going to be used for other text strings.
* "{Player} sent {Pokémon} out!" instead of "{Player} sent out {Pokémon}!"
* "A wild {Pokémon} appeared!" became just "Wild {Pokémon} appeared!" (this change would be reverted in Pokémon XD: Gale of Darkness, where it has been kept since then)
** Similarly, "The enemy {Pokémon} fainted!" became simply "Enemy {Pokémon} fainted!" (also reverted in XD as the The was reinstated)
In a screenshot from the instruction manual, Professor Oak says "PLANT POKé BULBASAUR?" instead of "plant POKéMON BULBASAUR?" as in the final game.
===Post-release===
====Text====
On page 31 of Pokémon: Official Nintendo Player's Guide, a different text string for using on a tree on the overworld was used. It reads "<sc>Oddish Cut</sc> down a bush!", being used in a screenshot when cutting down the tree next to the Vermilion City Gym. The fact that Cut can also be used to destroy areas of tall grass may have been the reason for the change to "{Pokémon} hacked away with <sc>Cut</sc>!" in the final releases.
 has tileset data for <sc>Green</sc>. lacks any equivalent data for <sc>Red</sc>, however.Pokémon Red and Blue - The Cutting Room Floor
====Super Game Boy border tiles====
The US versions of Pokémon Red and Blue have tileset data for Pocket Monsters! logo on their Super Game Boy Border tiles. The European releases overwrote this data as it was needed.Unused Super Game Boy Borders TCRF
====Move animations====
After the infamous Porygon incident, all versions of Pokémon Red, Green, and Blue had the screen flashing frames of attacks for moves such as , , and slowed down to reduce the possibility of players having a seizure.
====Localization changes====
=====Chief Trainer class=====
The Japanese name of the unused trainer class is 「シルフのチーフ」 (Silph's Chief), implying that at one point the player may have had the requirement or option of battling the Silph Co. president.
=====Spanish fishing error=====
When encountering a Pokémon using a fishing rod, the game says "The hooked <POKÉMON> attacked!" In the Spanish localization, this was erroneously translated to "¡El malvado <POKéMON> atacó!". The word "malvado" translates roughly to "wicked" or "evil."Red and Blue Translation errors
=====French TM acronym=====
The acronym for TM in the French localization of the games is CT. However, when the player exchanges Lemonade for CT49, the text reads "TM49... TRIPLATTAQUE!".
=====Squirtle Pokédex entry=====
In the Spanish and Italian localizations of the games, both versions erroneously refer to Squirtle's shell as "concha" and "conchiglia" which translates to "seashell" in Spanish and Italian respectively.
=====Substitute behavior=====
In the Japanese versions of Pokémon Red, Green, Blue, and Yellow, the (, , , and ) fail if the opposing Pokémon has a . This same behaviour occurs in the Pokémon Stadium series and all Generation II games.
Due to an oversight, in the localizations of the Generation I games, HP-draining moves can hit a Pokémon's substitute, but if they break the substitute they fail to restore any HP.
=====Pokédex weight change=====
In the Japanese Pokémon Red and Green, 's weight is listed as 6.0 kg. This was corrected in the Japanese Pokémon Blue to 60.0 kg. is also affected as its weight in the Japanese Pokémon Red and Green is listed as 2.0 kg, this was also corrected in the Japanese Pokémon Blue to 20.0 kg.
These changes are purely cosmetic because, at the time, no game mechanics used weight, and had a chance to flinch instead.
==References==
de:Pokémon Grün, Rot, Blau und Gelb (Vorabversion)
it:Pocket Monsters aka e midori beta