@Alch: If you are going to flip parts of metagross around, you have to change the shading after you flip them. Otherwise you get Multi-Light Source Syndrome (MLSS). And second of all, the lines on his stomach don't fit. They just look like, well, lines, and they don't resemble metagross.
Wobbulass's belt thing needs some line art work, and pretty much all of the scratched parts in general.
Wobbunite's stomach thing shouldn't go up to his mouth. And the tail needs some work on shading and the outline.
Wobeowth's legs are the biggest problem, they don't fuse smoothly on you sprite. You have to make the legs look like they're part of a sprite, not some random thing you copy/pasted on.
But they're all decent. The biggest problem you have is scratching stuff, and you need to work on that.
@Raikizen: Great to hear that you're getting into spriting. Recolors are really easy so I suggest you move onto some simple fusions.