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Here's one I just came up with
>Acclimatize
Normal-type moves have their type changed to match the weather.
>Water-type Boomburst partnered with a Water Absorb mon
>Give it to a grass-type and they actually get decent fire coverage in sun rather than just HP fire
>Return becomes a stronger physical Water move than Waterfall
>Return is stronger than Stone Edge with 100% accuracy
>Ice types actually get a decent move other than Ice Beam
It's like Weather Ball, but better. Maybe make it affect normal-type moves targeting the user as well (like No Guard), so you can use it in e.g. hail while being Ice-type to get a handy resist to normal moves. If it affects everyone's normal moves regardless of target, then e.g. Flash Fire mons can be immune to Fake Out, Espeed, etc. The drawback, of course, is that you need to keep the weather up or it's useless.