Bulbasuar is one of the first 3 starter Pkmn. And is not wild nor will it ever be. My advice since your a newb and all is get all three starter pkmn. The game is about catching all 150 pkmn. Trade from friend or purchase the Leaf Green version with an adapter cord and trade all the Pokemon you can. You will learn that all Pokemon have their strengths and weaknesses. It will be fun.
Its totally LAME if you cheat though.
The only way is to choose him at the beginning of the game. I know, it sucks.
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you can not catch bulbasaur you have to pick him as your starter Pokemon
you cant get a wild bulbasaur in the game you get it as a starter Pokemon from professor oak when you beat red on mt silver
get firered or leafgreen and migrate it to pearl after national pokedex
Carnivine is not in FireRed Version unless you do SuperHack9973. Then you would get level 181 Carnivine that looks like Bulbasaur.