First you have to defeat the pokemon league and go to Kanto. In Kanto you have to go to Oak's lab and he will offer you one of the three starter pokemon for Kanto.
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you do not catch it . you can bulbasaur when you get it from proff oak
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
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 cannot find Bulbasaur in Pokemon Platinum. you can only get a Bulbasaur through trading from Pokemon Leaf Green or Fire Red. You can even use an AR to get Bulbasaur in Pokemon Platinum. Sorry I don't remember the code. Have fun and good luck.
To get bulbarsaur you first get the the national pokedex then go to pallet town and talk to professor oak then he gives you a choice out of bulbasaur squrtle and charmandarAfter you beet the Pokemon league go see professer oak and beet red then get a starter from him