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Because she has no moves to abuse Serene Grace with, no boomburst too, and her better form is locked behind using Relic Song mid battle forcing it to run mixed if you wanna use it.
Pirouette Meloetta, if it was akin to Lando and Hoopa (using an item outside of battle) would be used greatly as "Mega Lopunny but it can hold an item"
Sucks cause she is my favorite mythical.