Ampharos

This generation, Ampharos received a huge buff in the form of a Mega Evolution. Outside of Mega Ampharos's fabulous appearance, it also boasts the third highest Special Attack stat in the format, excellent 90 / 105 / 110 base defenses, and a secondary Dragon typing that allows it to check common Pokemon like Mega Charizard Y, Talonflame, Rotom-H, and Rotom-W. Mega Ampharos's low Speed also makes it a powerful threat on Trick Room.

Mega Ampharos's new typing does have its flaws though, for it is weak to the common Earthquake, but also to the common Dragon- and Ice-type coverage moves. While on the surface Mold Breaker might seem like a good ability, Mega Ampharos lacks any way to properly use it. As you can only use one Mega Evolution in battle, Ampharos faces heavy competition in this regard; its complete lack of versatility does it no favors either. Because of Mega Ampharos's low Speed, the second lowest of any fully evolved Dragon-type, it is very hard to use outside of Trick Room. Additionally, it lacks a powerful STAB Dragon move, having to make do with the relatively weak Dragon Pulse.