Let's break the game. Add things, take things, I don't care. It can be as ludicrous or simple as you wish. I'll start.

>Next gen introduces an item that lets a Pokemon have all of its abilities
>Delcatty is retyped to Fairy/Normal and gains Pixilate
This coupled with the item gives it Normalize and Pixilate simultaneously meaning that every move is a Fairy STAB
>It also gets a big stat buff