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Hydreigon-Mega
Type: Dragon/Dark
>Ability: Boosts the power of Aura and Pulse moves, such as Dragon Pulse and Dark Pulse, by 50%.
HP: 92
Attack: 105 -> 145 (+40)
Defense: 90 -> 100 (+10)
Sp. Atk: 125 -> 175 (+50)
Sp. Def: 90 -> 100 (+10)
Speed: 98 -> 88 (-10)
< It sees all living things as objects meant to be erased. Thankfully, it does seem to have selective blindness toward its trainer. >
Everyone wants to make Hydreigon a sweeper but I've always been more of a fan of wallbreaker Hydreigon.
I used to use Work Up Hydreigon with Superpower and Dragon Pulse because it would blow through unprepared stall teams in mid-ladder and blow up defensive cores everywhere else.
>+1 252 SpA Mega Launcher Hydreigon Dragon Pulse vs. 248 HP / 8 SpD Eviolite Chansey: 246-291 (34.9 - 41.3%) -- guaranteed 3HKO
>+1 4 Atk Hydreigon Superpower vs. 248 HP / 252+ Def Eviolite Chansey: 474-558 (67.4 - 79.3%) -- guaranteed 2HKO
You could eat a Chansey if it tries to wall you. Then, depending on your coverage, you could eat Toxapex with Earth Power, Skarmory with Fire Blast, Clefable with Flash Cannon (it 2HKOs if it tries to CM after being hit once without boosting), or you can run whatever other moves to handle whatever threats you want since he has such an expansive movepool.