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>this fucking raid SUCCEEDED
Make a Gardevoir carry.
My Build:
Covert Cloak
Tera Fairy
Telepathy
Draining Kiss
Light Screen
Skill Swap
Mystical Fire
252 HP 252 Sp Atk
Modest
Turn 1 Light Screen
Turn 2 Skill Swap, you need to be fast to get it off before the randos blow their load
Turn 3 start spamming Mystical Fire
Keep track of Light Screen and put it up immediately when it goes down.
Use a heal cheer if he chips you a little too low, it always goes first.
Don't stop Mystical Firing until he has -6 Sp Atk.
Tera your Gardevoir and then start spamming Draining Kiss. He will have Sunny Day by now and you will have stolen his Solar Power, so you will be contributing great damage and healing yourself to full.
???
Profit