This is all the pokemon that ash had as of Pokemon Black 2 & White 2 games  On Hand: Pikachu 

Released - Butterfree Pidgeot Lapras Seeking Togatic Cottonee Archeops Carracosta 

At Oak's - Bulbasaur Charzard Kingler Muk Taruos Snorlax Heracross Bayleef Totodile Noctowl Swellow Corphish Torkoal Glalie Donfan Secptile Staraptor Torterra Infernape Buizel Gliscor Gible Quilava Unfezant Oshawott Pignite Snivy Scraggy Leavanny Palpitoad Boldore Krookodile

Called - Squrtle Primeape Ambipom

Traded - Raticate 

Given Away - Hunter Togapi Beedriill Larvatar Riolu

From Trainer Borrowed - Rapidash Porygon Arbok Wezzing Meowth Hitmonlee Lulicolo Buneary Pachurisu Chensey Sudowoodo Raichu Spoink Mantyke Piplup

Magma's series - Ferrow Oddish Slowbro Primeape

Befriended - Mew Slowking Lugia Articuno Zapidos Moltras Mewtwo' Suecune Celebi Latias Lotios 'Jerachi Plusle Minnun Deoxys' Lucario Manaphy Darkrai 'Riolu 'Hippopotas Azelf Sheymin Giratina Arceus 'Zarua Rashiram Zekrom Ventini Keldio Melloetta Genesect

??? - Dunsparce

So you know this is in all black & white games as well as Black 2 & White to ending of each series it will update.. 

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