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After defeating Guzma and taking on the Kantonian Gym, I headed towards the Ghost trial.
Had to sacrifice Gumshoos to Totem Mimikyu to remove its disguise with Mud-Slap. I was expecting the add Banette to spam Screech but instead it kept burning my Pokemon. Anyway, Eira (Miltank) and Choux (Carbink) took care of things.
For now I'll grind a little before going to the Aether House.