White Treehollow

White Treehollow (Japanese: White Tree Hollow) is a facility initially exclusive to Pokémon White 2. Located within White Forest, it is the counterpart to the Black Tower of Pokémon Black 2. The two facilities are collectively known as Unova's Challenge.
If a of White 2 clears Area 5 of the White Treehollow, that player can send the Treehollow Key to Black 2 players, granting them access to White Forest, and consequently, the White Treehollow.
==Description==
The White Treehollow was established in White Forest between the events of Pokémon White and Pokémon White 2. The player cannot challenge it until they have defeated Alder in Floccesy Town after entering the Hall of Fame.
It comprises ten procedurally generated, progressively more complex areas, each with a number of Trainers. In each area, a randomly selected Trainer is the gate Trainer, who will unlock the door to the 's room when defeated. Defeating an area's Boss Trainer allows the player to challenge the next area. Exactly one of the Trainers on each floor is a , who will never be the gate Trainer, and upon being defeated in battle, will offer to heal the player's Pokémon but can only do so once. Areas 6 and beyond, which span multiple floors, will therefore have multiple Nurses. Some rooms will provide opportunities for players to use or for easier navigation. Each room can contain up to two (Areas 1-6) or three (Areas 7-10) Trainers, but no Trainers will appear in the room with the elevator; and Cut or Strength rooms, as well as the boss room, will always have exactly one Trainer.
Unlike true battle facilities, a battle style setting of "Shift" will be respected here, and the player will earn experience and money for winning battles, though they will forfeit the money earned during the challenge if they lose or retire out instead of completing the area. However, like in those facilities, encountering a Pokémon here does not cause it to register as being seen in the Pokédex. The use of Bag items is also disabled, both in-battle and out (except that the Bag can still be accessed from the Pokémon menu, for the limited purpose of giving a held item to a Pokémon). Items and menus registered to the Y button will not respond during a challenge, but all options that are normally on the X button menu still exist (other than Bag, which is replaced by a Retire option instead) and can be accessed during the challenge, as can the C-Gear.
 Summary of floors
 	 	 	 	
1 	1 	Blue 	3×3	8
2 	1 	Blue 	3×3	10
3 	1 	Green 	3×3	12
4 	1 	Green 	4×4	16
5 	1 	Green 	4×4	16
6 	2 (B6-B7) 	Yellow	3×3	12
7 	3 (B8-B10) 	Yellow	3×3	14
8 	2 (B11-B12)	Yellow	4×4	24
9 	3 (B13-B15)	Yellow	4×4	24
10	4 (B16-B19)	Red 	4×4	24
During the player's first playthrough in White 2, the beginning floors will feature scripted cutscenes with the gate Trainer going over the mechanics of White Treehollow, and those floors will contain fewer trainers than usual. The trainer count on each floor is established prior to the placement of the Boss Trainer's room, and may vary slightly from the listed figure depending on how many Trainers were originally in the room before being displaced by the Boss.
==Items==
Upon defeating the Boss Trainer of an area, the player is rewarded with one or two items within a rotation, as presented below. 
{| class="roundy" style="margin:auto; background: #; border: 3px solid #"	 	
Area 	Reward	Reward
Areas 1-3	 	HP Up
Areas 1-3	 	Protein
Areas 1-3	 	Iron
Areas 1-3	 	Calcium
Areas 1-3	 	Zinc
Areas 1-3	 	Carbos
Areas 4-5	 	HP Up ×2
Areas 4-5	 	Protein ×2
Areas 4-5	 	Iron ×2
Areas 4-5	 	Calcium ×2
Areas 4-5	 	Zinc ×2
Areas 4-5	 	Carbos ×2
In addition, players of White 2 will also receive the Treehollow key to send to Black 2 players upon completing Area 5 for the first time.
==Trainers==
Non-Boss Trainers that can be battled will all be from the following Trainer classes. Each class uses only Pokémon that award effort values in a single predetermined stat, and gives a specific type of hint after being defeated:
 	 	
♂ 	HP 	How many Trainers are in the room with the gate Trainer
♀ 	HP 	Whether the gate Trainer is standing, walking, or spinning
 	Attack 	Which direction the gate Trainer's room is, relative to the current room
 	Attack 	Whether the gate Trainer is male or female
 	Defense	How many Trainers are in the room with the gate Trainer
 	HP 	Whether the gate Trainer is standing, walking, or spinning
 	Defense	How many Trainers are in the room with the gate Trainer
 	HP 	Whether the gate Trainer is male or female
 	Attack 	Which direction the gate Trainer's room is, relative to the current room
 	Attack 	Whether the gate Trainer is on a higher, lower, or the same floor
Construction	Defense	Which direction the gate Trainer's room is, relative to the current room
Ice 	Defense	Whether the gate Trainer is on a higher, lower, or the same floor
♂ 	HP 	Which direction the Nurse's room is, relative to the current room
♀ 	HP 	Identifying the Boss Trainer's lead Pokémon
 	Attack 	Offering a single-use opportunity to heal
If a Policeman, Black Belt, or construction Worker is in the same room as the gate Trainer, or on a different floor, their hint will be replaced by the generic message "Those are some skills! Don't you go losing to anyone, now!" If a male Pokémon Breeder is in the same room as the Nurse, their hint will become "Oww! Come on. Take it easy on me!" No matter what Trainer class the gate Trainer is, their hint either describes the direction to the Boss Trainer's room (which is always one room north of the room that contains the gate) in areas 1-5, or identifies the numbered floor that the Boss Trainer is on (possibly the current floor) in areas 6-10.
After the gate Trainer has been defeated, all hints that relate to the whereabouts of that Trainer will be replaced by generic messages.
Normal Trainers use two randomly selected Pokémon from their personal pool. Each of these Pokémon has a randomly generated level (within the level range for its area, which is reduced by 5 levels in Easy Mode and increased by 5 levels in Challenge Mode), gender (if the Pokémon's species has genders), and Ability (from among its possible non-Hidden Abilities). Both Pokémon will match in level, but not necessarily in gender. Trainers give out 40 times the level of their Pokémon after being defeated. Unlike in Black Tower, no non-Boss Trainers give increased prize money, but Pokémon Breeders use only , , and/or , and therefore provide significantly more Exp. Points than other Trainers. Opposing Pokémon will not hold any items except , and only for Trainers that are sufficiently far: most Trainer classes begin using sets that include Berries starting with Area 5, Nurses begin doing so in Area 6, and Pokémon Breeders will never use Pokémon that hold items.
The Boss Trainers always use a fixed set of three Pokémon. Benga is the Boss Trainer of Area 10 in White 2, and upon first visit in Black 2 (but only if the player hasn't yet completed Area 10 of Black Tower first). Players of Black 2 will face Jariel instead of Benga on subsequent visits. Each Boss Trainer has their Pokémon with 3 levels more and gives the player 600 more than the previous area's Boss Trainer.
===Area 1===
Normal Trainers in Area 1 have Pokémon whose levels range from 47 to 50 in Normal Mode. 
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===Area 2===
Normal Trainers in Area 2 have Pokémon whose levels range from 50 to 53 in Normal Mode. 
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===Area 3===
Normal Trainers in Area 3 have Pokémon whose levels range from 53 to 56 in Normal Mode. 
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===Area 4===
Normal Trainers in Area 4 have Pokémon whose levels range from 56 to 59 in Normal Mode. 
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===Area 5===
Normal Trainers in Area 5 have Pokémon whose levels range from 59 to 62 in Normal Mode. 
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===Area 6===
Normal Trainers in Area 6 have Pokémon whose levels range from 62 to 65 in Normal Mode. 
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===Area 7===
Normal Trainers in Area 7 have Pokémon whose levels range from 65 to 68 in Normal Mode. 
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===Area 8===
Normal Trainers in Area 8 have Pokémon whose levels range from 68 to 71 in Normal Mode. 
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===Area 9===
Normal Trainers in Area 9 have Pokémon whose levels range from 71 to 74 in Normal Mode. 
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===Area 10===
Normal Trainers in Area 10 have Pokémon whose levels range from 74 to 77 in Normal Mode. 
====White 2====
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====Black 2 (if Benga has already been defeated in either White Treehollow or Black Tower)====
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==In the manga==
===Pokémon Adventures===
========
In Deduction Time, Iris, Alder, and Gorm broke out of the White Treehollow after White Forest had been frozen over by the Plasma Frigate. In Giant Chasm, Iris revealed that she had at the White Treehollow together with Alder, , Gorm, and Benga. Since Alder and N were the strongest s in Unova, by the virtue of Alder being the and N having beaten him, Iris had challenged and beaten them both, making her the new Unova League Champion.
==In the TCG==
This listing is of cards mentioning or featuring White Treehollow in the Pokémon Trading Card Game.
==Trivia==
* The ordinary Boss Trainers follow an alphabetical naming pattern, having initials A through J in the English versions, and ア a through ワ wa in Japanese versions.
* With 20 floors, White Treehollow is tied with Black Tower for having the most accessible floors out of any known location in the Pokémon world.
==In other languages==
==Related articles==
*White Forest
*Black Tower
Category:Unova locations
Category:Black 2 and White 2 locations
de:Weiße Baumhöhle
es:Cavernogal Blanco
fr:Arbre Creux Blanc
it:Antro dell'Albero Bianco
ja:しろのじゅどう
zh:白色树洞