A while back myself and two of my friends made a Pokemon battle simulator. Over the two weeks we made this game I searched the internet for attack animations and various other graphics assets.
I have sprite sheets for various attacks including: shadow ball (2) (moving across the screen), Aeroblast (and its background), blastburn, confuse, fireblast and its background, frenzy plant, hydro cannon and its background, hydro pump, mudshot, mudsport, rock smash, seed flare, surf, swift, thunder (2), and wood hammer (2). These are animated and on sprite sheets.
I also have backgrounds for the attacks: dynamic punch, giga impact, heatwave, leaf storm, psychic, close combat, a generic speed attack background and spacial rend.
Finally i have sprites for "static" animations which include: firepunch, kick, punch, scratch, shadow claw, x-scizzor, chop, and two generic attack sprites.
If you would like me to upload them please just msg me.
Scubed