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Mewtwo with Focus Blast
What if Mewtwo spawns are going to be super rare and the only one to ever pop up in your small town has a C/FB moveset, which counters to use?
Alakazam PC/SB -> glass cannon Lugia DT/SA -> too slow Tyranitar -> one-shot by FB Gengar -> 2-shot by Confusion Scizor -> no bulk and doesn't resist FBI really don't see how to counter that without it ending in a massacre...