As always, I'll review the few that I find need comments on.
Green Machop revamp looks good in the coloring, but sometimes you have to fix these old sprites. The main problem with it is the absurdly different arm size, but the chest area and the top of the head also need some fixing. You might want to fix the legs and tail too.
Silver vaporeon looks good, but I think the face is too bright. Try using more of a darker shade on it.
Charlibi looks okay in general, but the wings look overgrown and disconnected. Other than that, the only problem I see are the outlines, which are a bit choppy.