Umm, the sprites. I should C&C the sprites, right?
Everything else, has been said.
Always save as .png and never save as .jpg. .jpg ruined the quality.
Some part isn't connected and completely out of place.
And you flipped zapdos wing. Never copy-flip, never. It ruined the shading and somehow make it looks unnatural.
And is it a resized part on marshplup? Never resize sprites. Even though you don't resize here I'm just going to say that.
Hope this isn't really harsh, and I hope this help.
NB: You don't need to make two sprites thread at once, just make one thread for all your sprites.