Re: I want to beat Pokemon Blue with one Pokemon
Bulbasaur's a good Pokemon to have in Blue. Bulbasaur's basic stats are higher than Charmander's, but on the other hand Charmander's Attack, Special Attack and Speed are even so it might be easier to take down tough Pokemon first. But Charmander's HP, Defense and Special Defence are quite poor so foes will have a hard time taking down Bubasaur.
So Bulbasaur's a great choice to have. Remeber you can always start the game again if you have to.