Gardevoir

Mega Gardevoir is a defining force in the metagame, boasting the status of one of the most powerful wallbreakers in the tier thanks to a sky-high base 165 Special Attack stat as well as an incredible ability Pixilate, which makes her Hyper Voice dreadful to take. Although Mega Gardevoir is superb at breaking apart the tier's top walls, such as Tomohawk, it is no slouch against offensive Pokemon either with base 100 Speed and base 135 Special Defense. Gardevoir's non-attacking movepool includes Taunt and Calm Mind, which makes it even harder to stop with passive Pokemon such as Chansey.

However, Gardevoir's physical bulk is pathetic in comparison to its Special Defense, with most physical attacks taking huge chunks out of Gardevoir's HP. This is problematic in a metagame infested with powerful physical attackers, such as Colossoil, Mega Altaria, and Mega Scizor. Gardevoir's weaknesses to Steel, Ghost, and Poison prey on its weak Defense, making Gardevoir easy prey for the likes of Mega Metagross.