Mass outbreak

Mass outbreaks (Japanese: mass outbreak), also known as swarms, Pokémon outbreaks, or wild outbreaks, are a feature introduced in Generation II that allows the to catch Pokémon that are usually rare or otherwise unobtainable. They appear from Generations to , and in , , and .
==In the games==
===Generation II===
In Generation II, if the player registered a certain Trainer in the Pokégear, that Trainer occasionally calls to tell the player that they saw or heard about a large number of Pokémon in a certain area. Until midnight (in-game time), the swarming Pokémon appear in the given area with much greater frequency than the usual 1%. Only one swarm can appear per day. The player can force a particular swarm to appear if a swarm has not already appeared that day by first deleting all possible phone numbers except the swarm Trainer's and then repeatedly toggling Daylight Savings Time by speaking with the player's Mom in New Bark Town. There is a 50% chance of triggering a phone call every time DST is changed.
========
 	Pokémon	Pokémon	Location 	Levels 	Notifier 	Game	Game	Game
0183	 	 	Mt. Mortar	13-15 	Parry () 	 	 	
0193	 	 	 	12-14 	Arnie () 	 	 	
0206	 	 	Dark Cave 	2-4 	Anthony ()	 	 	
0209	 	 	 	16 	Chad () 	 	 	
0211	 	 	Fishing 	5/20/40Old/Good/Super Rod 	Ralph () 	 	 	
0223	 	 	Fishing 	10/20/40Old/Good/Super Rod	Wilton () 	 	 	
===Generation III===
In Generation III, in addition to making rare Pokémon temporarily more common, this feature can be combined with record mixing to allow the player to catch Pokémon that cannot be caught at all normally. Pokémon encountered through mass outbreaks will also have a predefined set of moves.
After entering the Hall of Fame, every time the player finishes a battle, there is a ~0.5% (328/65536) chance that the game will generate an outbreak; this does not apply to link battles, e-Reader battles, the Safari Zone, or the Battle Tower/Frontier. After an outbreak is generated, the television program announcing it will appear the next day. Once the television program has been watched, the outbreak becomes active.https://twitter.com/starla4444/status/937089825093627904 Once outbreak has been activated, it will last until the end of the next day - during this time there's a 50% chance the game will generate the swarming Pokémon instead of using the usual encounter table (effectively halving the encounter rate for non-swarming Pokémon). However, seemingly due to an oversight, a particular savefile can only generate a mass outbreak only once without record mixing; that is, after record mixing, the game will be able to generate another outbreak on its own, after which the player has to do record mixing again, and so on.https://github.com/pret/pokeemerald/blob/2efbd5f549bd03cfdaea2c84d48d5fb706034464/src/tv.c#L1658
The record mixing feature of allows players to give an outbreak they've seen to other players, regardless of whether that outbreak would naturally occur in the player's game. The traded outbreaks will be announced on television in the following days after mixing records.
========
 	Pokémon	Pokémon	Location	Levels 	Game	Game	Game	Moves
0283	 	 	 	3 	 	 	 	
{|
0283	 	 	 	 	 	 	 	
0283	 	 	— 	—	 	 	 	
0283	 	 	 	 	 	 	 	
===Generation IV===
Mass outbreaks were largely expanded in Generation IV. Once the player attains the National Pokédex and has entered the Hall of Fame, a "swarm of Pokémon" will appear every day in a particular location, which changes the probability of finding the given Pokémon from 0% to 40%. Outbreaks last only one day and are random events. Information about mass outbreaks can be found in Sandgem Town by talking to 's sister or by watching the Sinnoh television , or by listening to Professor Oak's Pokémon Talk .
When players are active members of the same group, they will all experience the same outbreak on any given day. When a group is created, it is initialized with a random value. For every day that passes, this value is updated by seeding the RNG with the current day's value and generating a new value. On a given day, this value is used to determine which location has a mass outbreak. 
Because of this mechanism, the sequence of swarming Pokémon is fixed for each group. So even if the date is edited, the next swarm will always be the same. If the DS clock is changed or a different DS is used, then the game will detect this and will not change the species swarming until 12:00 AM.
========
Many of the Pokémon obtained through mass outbreaks are outside of the Sinnoh Pokédex, and are usually otherwise exclusive to other regions.
Due to the high encounter chances for Pokémon that appear during outbreaks, they make for longer and better chains when using the Poké Radar.
 	Pokémon	Pokémon	Location 	Levels 	Game	Game	Game
0016	 	 	 	51 	 	 	
0081	 	 	Fuego Ironworks 	28-29 	 	 	
0083	 	 	 	28, 29 	 	 	
0084	 	 	 	2 	 	 	
0096	 	 	 	19, 20, 21	 	 	
0098	 	 	 	52 	 	 	
0098	 	 	 	48-49 	 	 	
0100	 	 	 	28, 29 	 	 	
0104	 	 	 	4 	 	 	
0108	 	 	Lake Valor 	34, 36 	 	 	
0127	 	 	 	48-49 	 	 	
0177	 	 	 	53 	 	 	
0177	 	 	 	50 	 	 	
0206	 	 	 	16 	 	 	
0206	 	 	 	18 	 	 	
0209	 	 	 	16 	 	 	
0209	 	 	 	18-19 	 	 	
0220	 	 	 	34 	 	 	
0222	 	 	 	50 	 	 	
0222	 	 	 	48 	 	 	
0225	 	 	 	32 	 	 	
0225	 	 	 	32-33 	 	 	
0231	 	 	 	5, 7 	 	 	
0238	 	 	Lake Acuity 	35 	 	 	
0246	 	 	 	16 	 	 	
0263	 	 	 	3 	 	 	
0283	 	 	Lake Verity 	2 	 	 	
0287	 	 	Eterna Forest 	10, 11 	 	 	
0296	 	 	 	50-51 	 	 	
0296	 	 	 	48-49 	 	 	
0299	 	 	 	14 	 	 	
0300	 	 	 	39, 40 	 	 	
0309	 	 	Valley Windworks	7 	 	 	
0309	 	 	Valley Windworks	9-10 	 	 	
0325	 	 	 	21, 22, 23	 	 	
0327	 	 	 	55 	 	 	
0327	 	 	 	53-54 	 	 	
0359	 	 	 	20 	 	 	
0374	 	 	 	53 	 	 	
0374	 	 	 	51-52 	 	 	
========
The feature continues to appear in , where the wild Pokémon available include all those in original Generation II games, plus Ditto, Chansey, and Pokémon from Hoenn and Sinnoh. Information on swarms can now be found by listening to Professor Oak's Pokémon Talk on the Pokégear radio.
 	Pokémon	Pokémon	Location 	Levels 	Game	Game
0113	 	 	 	23 	 	
0132	 	 	 	34 	 	
0183	 	 	Mt. Mortar 	15 	 	
0193	 	 	 	12 	 	
0206	 	 	Dark Cave 	2-3 	 	
0209	 	 	 	16 	 	
0211	 	 	Fishing 	10/20/40Old/Good/Super Rod	 	
0223	 	 	Fishing 	10/20/40Old/Good/Super Rod	 	
0261	 	 	 	2 	 	
0278	 	 	Vermilion Citying 	35 	 	
0280	 	 	 	10-11 	 	
0302	 	 	 	13-15 	 	
0303	 	 	 	13-15 	 	
0316	 	 	 	5 	 	
0333	 	 	 	23 	 	
0340	 	 	Violet CityFishing	10/20/40Old/Good/Super Rod	 	
0343	 	 	 	5 	 	
0366	 	 	ing 	35 	 	
0369	 	 	Fishing 	10/20/40Old/Good/Super Rod	 	
0370	 	 	ing 	20 	 	
0401	 	 	Viridian Forest 	3 	 	
0427	 	 	 	8-10 	 	
===Generation V===
The gates in Unova have a monitor inside that will alert the player to where an outbreak is taking place.
Unlike in previous games, mass outbreaks can be manipulated by soft resetting the game, but only if the player has not saved their game at all that day. When the game is restarted, there will be a different Pokémon swarming.
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During , the monitor may occasionally not report on outbreaks, which is due to parts of Route 8, where Croagunk can be found, becoming frozen during winter and not allowing the Pokémon to be found there. All outbreaks in these games have a level range of 15-55.
 	Pokémon	Pokémon	Location	Levels	Game	Game
0046	 	 	 	15-55 	 	
0056	 	 	 	15-55 	 	
0083	 	 	 	15-55 	 	
0084	 	 	 	15-55 	 	
0102	 	 	 	15-55 	 	
0161	 	 	 	15-55 	 	
0193	 	 	 	15-55 	 	
0204	 	 	 	15-55 	 	
0228	 	 	 	15-55 	 	
0235	 	 	 	15-55 	 	
0236	 	 	 	15-55 	 	
0261	 	 	 	15-55 	 	
0285	 	 	 	15-55 	 	
0311	 	 	 	15-55 	 	
0312	 	 	 	15-55 	 	
0313	 	 	 	15-55 	 	
0314	 	 	 	15-55 	 	
0353	 	 	 	15-55 	 	
0360	 	 	 	15-55 	 	
0449	 	 	 	15-55 	 	
0453	 	 	 	15-55 	 	
====Pokémon Black 2 and White 2====
All outbreaks in these games have a level range of 40-55 and an encounter rate of 40%.
 	Pokémon	Pokémon	Location 	Levels	Game	Game
0022	 	 	 	40-55 	 	
0079	 	 	Abundant Shrine 	40-55 	 	
0083	 	 	 	40-55 	 	
0084	 	 	 	40-55 	 	
0097	 	 	Dreamyard 	40-55 	 	
0122	 	 	 	40-55 	 	
0162	 	 	 	40-55 	 	
0166	 	 	 	40-55 	 	
0168	 	 	 	40-55 	 	
0177	 	 	 	40-55 	 	
0185	 	 	 	40-55 	 	
0187	 	 	 	40-55 	 	
0195	 	 	 	40-55 	 	
0204	 	 	 	40-55 	 	
0277	 	 	 	40-55 	 	
0284	 	 	 	40-55 	 	
0311	 	 	 	40-55 	 	
0312	 	 	 	40-55 	 	
0313	 	 	 	40-55 	 	
0314	 	 	 	40-55 	 	
0317	 	 	 	40-55 	 	
0332	 	 	Reversal Mountain	40-55 	 	
0450	 	 	Desert Resort 	40-55 	 	
===Generation VIII===
========
Pokémon outbreaks return for the first time since , featuring the same encounters as in .
Unlike in Generation IV, the Pokémon featured in the mass outbreaks appear visibly in the tall grass, popping in and out en masse. These Pokémon cannot be interacted with, however, as they vanish back into the grass if the player approaches them, and the means of encountering them remains the same as in the original games. The information about a current outbreak is found in the pause menu, however, Lucas/Dawn's little sister can still tell the player what outbreak is currently active.
 	Pokémon	Pokémon	Location 	Levels
0016	 	 	 	51
0081	 	 	Fuego Ironworks 	28-29
0083	 	 	 	28
0084	 	 	 	2
0096	 	 	 	20-21
0098	 	 	 	52
0100	 	 	 	28
0104	 	 	 	4
0108	 	 	Lake Valor 	34, 36
0177	 	 	 	53
0206	 	 	 	16
0209	 	 	 	16
0220	 	 	 	34
0222	 	 	 	50
0225	 	 	 	32
0231	 	 	 	5
0238	 	 	Lake Acuity 	35
0263	 	 	 	3
0283	 	 	Lake Verity 	2
0287	 	 	Eterna Forest 	10
0296	 	 	 	50-51
0299	 	 	 	14
0300	 	 	 	40
0309	 	 	Valley Windworks	7
0325	 	 	 	22-23
0327	 	 	 	55
0359	 	 	 	20
0374	 	 	 	53
========
Pokémon Legends: Arceus has two types of outbreaks: mass outbreaks and massive mass outbreaks (Japanese: 大大大発生). Prior to v1.1.0, only mass outbreaks were available. Outbreaks can be seen on the Hisui map when choosing where to travel. They are indicated by a circle with the headshot of a Pokémon (for a mass outbreak) or a question mark (for a massive mass outbreak) over an area.
 	De/activation%	Outbreaks per area	Spawns per outbreak	Spawns per outbreak	Spawns per outbreak
Mass outbreak 	20% 	1 	10-15 	10-15 	10-15
Massive mass outbreak	25% 	11-15 	Wave 1: 8-10 	Wave 2: 6-7 	
In a mass outbreak, many Pokémon—from the same evolutionary line—spawn in a single location. Only a single mass outbreak can be active in an area at a time, but multiple areas can have a mass outbreak. In total, a mass outbreak will spawn 10 to 15 Pokémon before ending, with 4 Pokémon being spawned at any given time. A new mass outbreak may activate any time the player returns to Jubilife Village, at a 20% chance per area; when leaving the village, there is also a 20% chance an outbreak will deactivate per area, except for the area the player is traveling to.Kaphotics on Twitter: "Mass Outbreaks..." Additionally, the contents of the mass outbreak are determined upon traveling to that region, rather than when the Pokémon spawn.
In a massive mass outbreak, many mass outbreaks (11 to 15) occur in an area. Massive mass outbreaks draw on their own set of mass outbreaks that has some overlap with species seen in normal mass outbreaks, but also many unique species. Initially, each outbreak location is only visible as a question mark; they can be revealed by visiting each location or by giving 5 Aguav Berries to Mai's (near the area's exit). When revealed, some locations may be highlighted by a yellow circle, with either a Berry or a star marking it. A star indicates that that location has extra waves to its outbreak. A Berry indicates that each time a Pokémon from that outbreak is defeated or caught, the player will receive one Aguav Berry. There may be zero or multiple locations with a Berry or a star (but never with both). Each outbreak location has a 10% chance to be a Berry location, but only if it is not a starred location.
If a location in a massive mass outbreak initially has a star, then it will spawn Pokémon in two waves. After clearing all Pokémon in the first wave, a second wave will spawn with Pokémon that are either evolved versions of the original wave (with a small chance for any to be an alpha Pokémon), one of the species from the first wave but always as alpha Pokémon, or both (i.e. evolved versions of the original wave, all of which are alpha Pokémon). If the second wave consists of evolved versions, the map icon for the location will change to reflect this; either way, however, the star will remain present on the map during the second wave. A cleared location that does not have a Berry or star has a chance to nonetheless produce a second wave as though it did have a star.
All Pokémon found in massive mass outbreaks will be at least level 60, unless the Pokémon's species is one that evolves starting at a specific level, in which case non-alphas of that species will be found 1-3 levels under the level required for evolution.
Massive mass outbreaks last for a limited time after the player arrives at the containing area. They may start with 7, 9, or 11 minutes of time. As the time wanes, the game will display a warning at certain intervals.
Time remaining 	Message 	Start point chance
0 minutes 	The rainstorm seems to have ended. 	--
1 minute 	The rainstorm seems like it’s about to clear up. 	--
2 minutes, 30 seconds	The rainstorm may go on a bit longer. 	--
5 minutes 	The rainstorm shows no signs of stopping anytime soon.	--
7 minutes 	The rainstorm shows no signs of stopping anytime soon.	75%
9 minutes 	The rainstorm shows no signs of stopping anytime soon.	15%
11 minutes 	— 	10%
Pokémon in outbreaks have increased chances of being . For example, with the Shiny Charm (and therefore all research task bonuses), wild Pokémon have a Shiny rate of approximately 0.17%, Pokémon in a mass outbreak have a rate of 0.78%, and Pokémon in a massive mass outbreak have a rate of 0.46%. For full details, see Shiny Pokémon → Pokémon Legends: Arceus.
The Pokémon that can appear in each area in outbreaks are as follows (mass outbreak and massive mass outbreak are abbreviated as M.O. and M.M.O., respectively, Pokémon marked with an * only spawn in massive mass outbreaks of their pre-Evolution or from a second wave):
The majority of Pokémon species in Hisui can have a mass outbreak in the area(s) where they normally spawn in the overworld, with the exception of four categories:
* Pokémon species that never appear in the overworld (Legendary and Mythical Pokémon, , , , etc.);
* Pokémon species that appear in the overworld exclusively as fixed alphas (such as , , , , , etc.);
* Pokémon species that appear in the overworld exclusively in space-time distortions (first partner Pokémon lines, Eeveelutions, line, and lines, etc.);
* Pokémon species that exclusively appear flying in the overworld (, , Hisuian , , ).
Additionally, Pokémon that normally spawn only during the day or at night in the overworld can have an outbreak at any time of day, such as or being able to have an outbreak in the day despite normally only appearing at night.
Two Pokémon have additional requirements for appearing in massive mass outbreaks:
* will not appear until all 108 Wisps are obtained and Request 22: "Eerie Apparitions in the Night" is complete.
* will not appear until all 28 forms have been found and cataloged in the Pokédex's Unown Research Notes.
# 	Pokémon	Pokémon	 	 	 	 	 	 	 	 	 	
# 	Pokémon	Pokémon	M.O.	M.M.O.	M.O.	M.M.O.	M.O.	M.M.O.	M.O.	M.M.O.	M.O.	M.M.O.
0025	 	 	✓ 	✓ 	 	 	 	 	 	 	 	
0026	 	 	 	✓* 	 	 	 	 	 	 	 	
0035	 	 	 	 	 	 	 	✓* 	✓ 	✓ 	 	
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===Generation IX===
========
==In animation==
===Pokémon the Series===
========
Prior to the events of The Dunsparce Deception, a mass outbreak of appeared in a town in Johto, which resulted in all of the children in the area catching one, except for a boy named Bucky, who was out of town when the outbreak occurred.
========
In The Clumsy Crier Quiets the Chaos!, Nurse Joy told and a tale of how a mass outbreak of rampaging had been once calmed down by a lone , leading to becoming Pokémon Center assistants all across Kalos.
========
In Ivysaur's Mysterious Tower!, Vermilion City was the site of a mass outbreak of and . Ash and Goh learned that the former grassland, now the site of a new , was the ideal site for the Bulbasaur line to absorb the solar energy and wind needed to undergo evolution.
In Gotta Catch a What?!, Ash and Goh ventured into the mountains to discover a reported outbreak. They learned that Pikachu had gathered because the area was rich in Thunder Stones, helping the Pikachu, including Goh's newly caught one, evolve into en masse.
In Trials of a Budding Master!, Goh learned of a mass outbreak of at the Rock Tunnel. After arriving there with Ash, he almost immediately found one and it.
== Trivia ==
* In-universe, the term massive mass outbreak was coined by Cyllene.Cyllene: "These must be somehow different from the mass outbreaks we know. Why don't we call this new phenomenon... a massive mass outbreak?" (Emphasis added.)
==In other languages==
Mass outbreak	
Massive mass outbreak
==Related articles==
* Dual-slot mode
* Poké Radar
==References==
Category:Game mechanics
Category:Pokémon Gold and Silver
Category:Pokémon Crystal
Category:Pokémon Ruby and Sapphire
Category:Pokémon Emerald
Category:Pokémon Diamond and Pearl
Category:Pokémon Platinum
Category:Pokémon HeartGold and SoulSilver
Category:Pokémon Black and White
Category:Pokémon Black 2 and White 2
Category:Pokémon Brilliant Diamond and Shining Pearl
Category:Pokémon Legends: Arceus
Category:Pokémon Scarlet and Violet
Category:Methods of obtaining Pokémon
de:Massiver Auflauf
es:Aparición masiva de Pokémon
fr:Apparition massive de Pokémon
it:Comparse massicce
ja:大量発生
zh:大量出现