Pokémon Platform [Charmander Anim.]

[water dog]

These are pretty good, a slight bit above average. Incoming compliment sandwich.

I'd like to posit that Squirtle's head appears to be directly pasted on the top of his body (in a 2D plane), or rather the head overlaps his shell and even his own arm. In the current view, the arm and part of the shell should be visible in front of his face. Also, if I remember correctly, the white "rim" of Squirtle's shell circles around his arms and legs, though that is nit picking.

Bulbasaur also appears to have some sort of growth on his back, and I'm not talking about his bulb. The portion between the back of his head and the front of his bulb makes him look like Quasimodo.

Overall your colors are very "vanilla." Try deviating from the MS Paint defaults and making your own colors. I know you (probably) made the different shades and what not, but color picking is a lot more than just double clicking your base color and shifting the slider down a few notches. Try making your shades and highlights a different hue as well as tone.

Overall though, it's rare to see someone who can nail outlines like you have without any form of prior C+C. Refreshing sprites, and done in a style Pokemon is usually not depicted in.

EDIT: There are numerous other faults I see, but don't worry about them now. I can help you with that if/once you fix what I mentioned above.