Medicham

Mega Medicham has near-exclusive access to one of the most coveted abilities in the game, Pure Power, which raises its subpar base 100 Attack to the highest in the entire metagame. This bloated Attack stat, in combination with Mega Medicham's wide movepool and powerful STAB moves, makes it a very effective wallbreaker. Furthermore, Mega Medicham's decent base 100 Speed allows it to outspeed almost every relevant defensive Pokemon in the metagame, and its access to priority moves such as Fake Out and Bullet Punch gives it utility against offensive threats as a revenge killer.

Despite these great strengths, Mega Medicham is held back by its frailty, which limits what it can safely switch into and allows it to be revenge killed by faster threats. Mega Medicham's Speed, while useful against defensive threats, can't hold a candle to the fast-paced offensive threats populating the metagame, which causes an overreliance on priority to deal with them. Mega Medicham also has difficulty getting past some common defensive staples such as bulky Psychic-types, and it is forced to compete with other Fighting-types, such as Mega Gallade and Mega Lopunny, both of which boast great Speed tiers.