Try not to make abilities completely broken or completely useless tho. Here are some of my ideas

Abilities to nerf:
-Parental Bond: The second attack deals even less damage OR if a move with a secondary effect is used, the effect activates only once. Or both. Fuck Parental Bond
-Gale Wings: The power of damaging moves affected by it is reduced
-Protean: Honestly I don’t know what to modify without changing the ability completely, it’s pretty straightforward
-Aerilate: It just change the type of Normal type moves, without the 30% boost. I don’t think Pixilate and Refrigerate necessarily need a nerf, but I feel like you either nerf all of them or none of them for consistency’s sake, so I don’t know

Abilities to buff:
-Hyper Cutter: Literally an inferior version of Clear Body, how is that fair? Now when an opponent reduces this pokemon’s attack, it raises it instead. It still doesn’t affect self-inflicted reductions, like with Superpower for example. Now it becomes very viable, seeing how Intimidate is a pretty common ability
-Iron Fist: All moves affected by Iron Fist are also affected by Tough Claws, and the boost is smaller. Jesus. Now Iron Fist provides a boost of 30%-40% to punching moves
-Klutz: What the fuck is even this ability. Now if the pokemon doesn’t have any held item it automatically gets a +1 Speed and a +1 Accuracy increase. Or a +2 Speed increase, depends how much the lack of an item is a disadvantage