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Giving balls in-battle effects like Held items would be a mess, and Nintendo knows that. You have abilities, advantages which are connected to the Pokemon's species, and held items, which are customizable advantages, and other minor advantages based on type and moves. Anything on the top of that...

-A ball that has very high capture rate on shinies. -A "Pillow Ball" that works better on slept Pokemon. -Heal Ball would give the Pokemon some EVs? I had a similar idea once, I called it "Yo-yo Ball". :D Boomerang Ball could work too...