You can catch them like suicune,raikou,and entei after you completed the National Dex or you can trade them from other games.
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Bulbasaur is a starter for the Johto Region, so you cant catch him in the Sinnoh.
You cannot catch a Bulbasaur in the wild. You must defeat Red on top of Mt. Silver. Then, you can go to Professor Oak and choose the bulbasaur.
you do not catch it . you can bulbasaur when you get it from proff oak
You cannot catch bulbasaur in diamond and pearl. If you have firered or leafgreen can set 6 Pokemon free in pal park and catch them there.
You can't, Bulbasaur is unobtainable. You have to trade, hack, cheat or get it from mystery gift.