Doesn't Charmander also require your Pikachu to be happy? I know Squirtle doesn't, but I think both Bulbasaur and Charmander do.

And fans of the anime's 1st season can really get a kick out of Yellow Version. In addition to the obvious references, it also features random trainers on Routes who have been given dialogue to turn them into AJ, the kid who trained a Sandshrew through 100 wins; and Joe and Giselle, the students from the fancy pokémon trainer's school. The ways you get Bulbasaur, Charmander and Squirtle also vaguely resemble the ways Ash got them...there are tiny little references galore.