From Bulbapedia, the community-driven Pokémon encyclopedia.
Amanita (Japanese: ショウロ Shōro) is the storage system creator of the Unova region, who lives in Striaton City. She was introduced in Generation V, an expert in computing, creating a Pokémon Storage System, succeeding Bebe's storage system.
In the games
Amanita was introduced in Generation V as the Pokémon Storage System creator living in Striaton City in the Unova region. It was she who developed Unova's storage system based on the previous designs of Bill, Lanette and Bebe.
In Black and White, the player first meets her in Striaton City where she gives the player a Box which can be accessed in the player's PC. She also tells the player about a new feature called the Battle Box which can be used to store the player's Pokémon for battle.
She has the player start out with 8 Boxes capable of holding 240 Pokémon. When all 8 Boxes have at least one Pokémon in them, the storage capacity will be increased to 16 Boxes, holding 480 Pokémon. When all 16 of those Boxes have at least one Pokémon in them, the capacity will be increased again to a maximum of 24 Boxes, holding 720 Pokémon.
In Black 2 and White 2, Amanita is found in Castelia City, along with Fennel. She will give the player an Eevee with a Hidden Ability after entering the Hall of Fame.
In the manga
In the Pokémon Adventures manga
Amanita appears in Battle in the Dreamyead as the assistant of Fennel. She shows Black her research project, dreams, after waking up. Later, she accompanies him along with White to the Dreamyard to find his Munna, Musha.