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Alright, gonna go full retard here.
Mega Wailord, ability Frightening Presence, kind've like an ability version of the move scary face, lowers speed by 1 stage on switch in or mega evolve.
Wailord gets huge as fuck, stats become 170/90/55/120/55/110, or in other words, +30 to special attack , +10 to both defenses, +50 to speed. Pic related.