THE FINAL BATTLE
Attack!
Alright, let's not get too crazy.
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Lunala strikes first, smacking Tyranitar with a Moonblast. Being part-Dark, that ought to be enough to take him out.
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Unfortunately, it doesn't seem like it was particularly close to doing the job. The big guy's still standing, and he doesn't look all that worse for wear. You may have made a mistake.
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Tyranitar's response is a vicious Crunch. Both of Lunala's types are weak to Dark, and even if her Shadow Shield were still up, Tyranitar's Choice Band jacks his attack damage up to a bullshit degree.
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Lunala drops like a... well, like a batlike alien god-thing, sort of. Tyranitar stands over her, victorious. The sandstorm he created continues to rage, but he's undeterred.
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The less powerful option was a bad idea. Your BEST idea would be to hit Tyranitar with everything you've got, and right now, everything you've got means Lopunny's High Jump Kick. Silver lining: with Lunala fainted, the switch doesn't cost your turn.

