Some abilities downright discourage usage of certain Pokemon. I’m not talking about balancing ones like Truant or Slow Start, although Defeatist is borderline. So why not make them useful?
Gluttony - Double belly consumption, eating food heals the user. Maybe upgrade it to just +HP when eating stuff. It’d not be any useful, but it’d still be better.
Klutz - Held items don’t work. Perhaps make it so items can’t get sticky instead?
Stall - Move range cap is 2. Maybe make it lower hitstun applied to the user and remove the cap.