It is very hard because it is a starter Pokemon and the only starter you can get is pekachu so trading from another game is the best idea.
That is what I found as the answer before, but if you're playing the Lightning Yellow that I am, you can only catch Bulbasaur in one patch of grass in Cerulean City. It's right below a house.
You can get bulbasaur at this lady's house in Cerulean City. She is a Pokemon nurse who catches Pokemon and nurses them back to health
Trade it from yellow/red/green.
A woman in the house West of the Cerulean City Pokemon Centre will give you a Bulbasaur if your Pikachu is happy enough. The Bulbasaur is level 10.
Once Pikachu is happy with you, talk to the lady next to the gym in Cerulean City. She will give you a Bulbasaur.
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You can get bulbasaur at this lady's house in Cerulean City. She is a Pokemon nurse who catches Pokemon and nurses them back to health
Cerulean city.
You can get Bulbasaur in Pokemon Red, Green and Blue from Professor Oak at the beginning of the game but in Pokemon Yellow you can get Bulbasaur in Cerulean City the house beside the Pokemon Center also beside the Cerulean Gym.
Bulbasaur learns Razor Leaf at lvl 27.
Trade it from yellow/red/green.
In Pokemon Yellow: Special Pikachu Edition, you get a Bulbasaur from the a girl in Cerulean city as a gift. Her house is next to the Pokemon Center. However, you can only acquire Bulbasaur from her if Pikachu's happiness is high enough
A woman in the house West of the Cerulean City Pokemon Centre will give you a Bulbasaur if your Pikachu is happy enough. The Bulbasaur is level 10.
Bulbasaur evolves at level 16
in cerulian city you go to the house next to the Pokemon centre
You get Pikachu at the beginning of the game, after you can get Charmander, Bulbasaur and Squirtle. (:
go to cerillian city and go to the house next to the Pokemon center and talk to the lady and she will give you the bulbasaur if your pikachu is happy enough
pikachu