I can help with animating and simple PSA parts
Though animations by me might need to be revamped. Here's some ideas i took from Sonic Wiki.
Chaos Impact, a powerful ground punch that creates a small earthquake
-D-Smash with Impale that hits ground only (there's a parameter for it but I can't remember what) . 21% maybe?
Chaos Strike, a blue energy pulse that harms and confuses enemies
- Blue flash overlay with no damage and large hit-box. Shield break status flag. Good on Neutral-B.
Chaos Bind, a move which freezes the air around the enemy for 30-40 seconds. Chaos Zero is also able to swim underwater for an unlimited amount of time.
-ERR....Maybe just time manipulation with water effects.
That's what I think would look kinda cool. Good luck on this project too.