Your sprites, are good, apart from the fact that the light source doesn't come from the top=left like it should.
Don't they though? I see how the Electrode evo has some extra highlighting, but that's the only one that looks even a little off and its shadow is still in the predicable place.
These are nice sprites, but personally I think the glow on the octopus head is too much and detracting from the piece as a whole. The legs (arms?) on it are very well done except for some of the inner ones where the outlines look a little sloppy. The outline and shading on the two side-by-side, overlapping feet make it look like you've doubled the thickness of the outline. Really though that's the only complaint I have with your sprites aside from the shading on your custom trainer's pant leg (the V shaped highlight feels off) and the placement of the facial features (too high).