This article is incomplete. Please feel free to edit this article to add missing information and complete it. Reason: number of times required to do something in order to get some of the medals
Medals (Japanese: メダルMedal) are a type of achievement in Pokémon Black 2 and White 2. They are stored in the Medal Box. There are 255 Medals in all, along with the Hint Medal. They are divided into five categories: 7 Special Medals, 98 Adventure Medals, 56 Battle Medals, 75 Entertainment Medals, and 19 Challenge Medals.
Win the Pokémon League with only Fire-type Pokémon.
Water-type Champ
みずチャンプ
Win the Pokémon League with only Water-type Pokémon.
Electric-type Champ
でんきチャンプ
Win the Pokémon League with only Electric-type Pokémon.
Grass-type Champ
くさチャンプ
Win the Pokémon League with only Grass-type Pokémon.
Ice-type Champ
こおりチャンプ
Win the Pokémon League with only Ice-type Pokémon.
Fighting-type Champ
かくとうチャンプ
Win the Pokémon League with only Fighting-type Pokémon.
Poison-type Champ
どくチャンプ
Win the Pokémon League with only Poison-type Pokémon.
Ground-type Champ
じめんチャンプ
Win the Pokémon League with only Ground-type Pokémon.
Flying-type Champ
ひこうチャンプ
Win the Pokémon League with only Flying-type Pokémon.
Psychic-type Champ
エスパーチャンプ
Win the Pokémon League with only Psychic-type Pokémon.
Bug-type Champ
むしチャンプ
Win the Pokémon League with only Bug-type Pokémon.
Rock-type Champ
いわチャンプ
Win the Pokémon League with only Rock-type Pokémon.
Ghost-type Champ
ゴーストチャンプ
Win the Pokémon League with only Ghost-type Pokémon.
Dragon-type Champ
ドラゴンチャンプ
Win the Pokémon League with only Dragon-type Pokémon.
Dark-type Champ
あくチャンプ
Win the Pokémon League with only Dark-type Pokémon.
Steel-type Champ
はがねチャンプ
Win the Pokémon League with only Steel-type Pokémon.
One and Only
ワンアンドオンリー
Win the Pokémon League with only one Pokémon in the party
Supreme Challenger
チャレンジジーニアス
Obtain all 18 other Challenge Medals
Trivia
Battling the Elite 4 using a single dual-type Pokemon will unlock two Challenge Type Medals. For example, using Dragonite will unlock both Flying-Type Champ and Dragon-Type Champ.