Can you tell me (Season 1-7) thanks in advance.

His old pokemon were all killed in a fire.




Seriously, did you ever watch the show, all pokemon that aren't in his party are at Oak's Lab. If you don't know this they you really don't pay attention to the show, like when he always returns to Pallet and his pokemon are at the lab. I can't believe you don't know this!

Actually, they're not all at Professor Oak's lab.  For example, he let his Butterfree go free to mate pretty early on.  He left his Pidgeot right after it evolved in the woods to protect a group of Pidgey, although I seem to remember Ash claiming that he was going to pick Pidgeot up again on the way back, but apparently that has yet to happen.  And he left Primeape with another trainer so that Primeape could become a champion fighter.  Plus Charizard is out there too.

Squirtle's also gone, back with the Squirtle Squad

and his Haunter he "caught" is with Sabrina now.

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http://en.wikipedia.org/wiki/Ash_Ketchum#Pok.C3.A9mon_with_Professor_Oak

And Lapras is Back with her Family and Charizard is in charafic Valley and The Fire Killed Ash's Father and Bayleef was Murdered by steve Urkel

Ash's original Bulbasuar turned into a Venasuar... and then I lost track. Now May has a Bulbasaur... Ash should have kept his.

What are you talking about? Ash's Bulbasaur never evolved, it's at Professor Oak's Lab

Too bad it's not a funny joke, if that person even meant it to be one

Actually, the only pokemon i've seen with Oak (in the advanced series) are muk (as always was) and taurus

Charizard is at the Charific (sp) Valley
Squirtle is with his old bandit buddies
Bulbasaur is with (forgot the name) that one girl with a perasite who made medicine.
Pidgeot is a 'mother' bird now

Bulbasaur is at the lab my friend.

And for the record, that was Meowth that wanted to be with her. You really haven't been watching if you haven't known that.