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Kirlia and Ralts would be good.
Special Attack based
Calm Mind FTW
Their leveling up movepool is quite bad but with a few TMs they can sweep anything
Evolves at level 3o into Gardevoir
Suggested Set
Calm Mind for Sweeping
Psychic is STAB
Thunderbolt for the lulz/ Shadow ball for ghosts
Double Team to making setting up easier
Welp, hope I helped