White Treehollow

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White Treehollow 白の樹洞
White Tree Hollow
"Wild Missingno. appeared!"
White Treehollow B2W2.png
Map description: {{{mapdesc}}}
Location: White Forest
Region: Unova
Generations: V
Unova Black City White Forest Black Tower White Treehollow Map.png
Location of White Treehollow in Unova.
Pokémon world locations

White Treehollow (Japanese: 白の樹洞 White Tree Hollow) is a training 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 player 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.


The interior of the White Treehollow

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 Boss Trainer'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 Nurse, 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 Cut or Strength 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
Area Floors Color scheme Floor size Trainers per floor
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.


Upon defeating the Boss Trainer of an area, the player is rewarded with one or two items within a rotation, as presented below.

Area Reward
Areas 1-3   HP Up
Areas 4-5   HP Up ×2
  Protein ×2
  Iron ×2
  Calcium ×2
  Zinc ×2
  Carbos ×2
Area Reward
Areas 6-7   Health Wing
  Muscle Wing
  Resist Wing
  Genius Wing
  Clever Wing
  Swift Wing
  Rare Candy
Areas 8-9   Health Wing ×2
  Muscle Wing ×2
  Resist Wing ×2
  Genius Wing ×2
  Clever Wing ×2
  Swift Wing ×2
  Rare Candy ×2
Area Reward
Area 10   Pomeg Berry
  Kelpsy Berry
  Qualot Berry
  Hondew Berry
  Grepa Berry
  Tamato Berry
  Rare Candy

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.


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:

Trainer class Effort values Hint after defeat
  Pokéfan HP How many Trainers are in the room with the gate Trainer
  Pokéfan HP Whether the gate Trainer is standing, walking, or spinning
  Black Belt Attack Which direction the gate Trainer's room is, relative to the current room
  Battle Girl Attack Whether the gate Trainer is male or female
  Janitor Defense How many Trainers are in the room with the gate Trainer
  Nursery Aide HP Whether the gate Trainer is standing, walking, or spinning
  Hiker Defense How many Trainers are in the room with the gate Trainer
  Baker HP Whether the gate Trainer is male or female
  Policeman Attack Which direction the gate Trainer's room is, relative to the current room
  Roughneck* Attack Whether the gate Trainer is on a higher, lower, or the same floor
  Construction Worker Defense Which direction the gate Trainer's room is, relative to the current room
  Ice Worker* Defense Whether the gate Trainer is on a higher, lower, or the same floor
  Pokémon Breeder HP Which direction the Nurse's room is, relative to the current room
  Pokémon Breeder HP Identifying the Boss Trainer's lead Pokémon
  Nurse 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 Happiny, Chansey, and/or Blissey, and therefore provide significantly more Exp. Points than other Trainers. Opposing Pokémon will not hold any items except Berries, 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.

Area 2

Normal Trainers in Area 2 have Pokémon whose levels range from 50 to 53 in Normal Mode.

Area 3

Normal Trainers in Area 3 have Pokémon whose levels range from 53 to 56 in Normal Mode.

Area 4

Normal Trainers in Area 4 have Pokémon whose levels range from 56 to 59 in Normal Mode.

Area 5

Normal Trainers in Area 5 have Pokémon whose levels range from 59 to 62 in Normal Mode.

Area 6

Normal Trainers in Area 6 have Pokémon whose levels range from 62 to 65 in Normal Mode.

Area 7

Normal Trainers in Area 7 have Pokémon whose levels range from 65 to 68 in Normal Mode.

Area 8

Normal Trainers in Area 8 have Pokémon whose levels range from 68 to 71 in Normal Mode.

Area 9

Normal Trainers in Area 9 have Pokémon whose levels range from 71 to 74 in Normal Mode.

Area 10

Normal Trainers in Area 10 have Pokémon whose levels range from 74 to 77 in Normal Mode.

White 2

Black 2 (subsequent visits)

In the manga

Pokémon Adventures

Black 2 & White 2 arc

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 trained at the White Treehollow together with Alder, N, Gorm, and Benga. Since Alder and N were the strongest Trainers in Unova, by the virtue of Alder being the Champion and N having beaten him, Iris had challenged and beaten them both, making her the new Unova League Champion.


  • 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

Language Title
Chinese Cantonese 白色樹洞 Baahksīk Syuhduhng
Mandarin 白色樹洞 / 白色树洞 Báisè Shùdòng
  French Arbre Creux Blanc
  German Weiße Baumhöhle
  Italian Antro dell'Albero Bianco
  Korean 백의 수동 Baeg-ui Sudong
  Spanish Cavernogal Blanco

See also

Nuvema TownAccumula TownStriaton CityNacrene CityCastelia CityNimbasa CityAnville Town
Driftveil CityMistralton CityIcirrus CityOpelucid CityPokémon LeagueLacunosa TownUndella Town
Black CityWhite ForestAspertia CityFloccesy TownVirbank CityLentimas TownHumilau City
Bridges and tunnels
Skyarrow BridgeDriftveil DrawbridgeTubeline BridgeVillage BridgeMarvelous BridgeMarine Tube
DreamyardWellspring CavePinwheel ForestLiberty GardenDesert ResortRelic CastleBattle SubwayLostlorn Forest
Cold StorageMistralton CaveChargestone CaveCelestial TowerTwist MountainDragonspiral TowerMoor of Icirrus
Challenger's CaveVictory Road (BWB2W2) • N's CastleRoyal UnovaGiant ChasmUndella BayAbyssal Ruins
Abundant ShrinePoké Transfer LabP2 LaboratoryEntralinkUnity TowerFloccesy RanchPledge GroveVirbank Complex
Pokéstar StudiosCastelia SewersJoin AvenueCave of BeingPokémon World TournamentReversal MountainPlasma Frigate
Clay TunnelUnderground RuinsStrange HouseRelic PassageSeaside CaveWhite TreehollowBlack Tower
Access to
Nature Preserve
Blueberry AcademyTerarium

  This article is part of Project Locations, a Bulbapedia project that aims to write comprehensive articles on every location in the Pokémon world.