Scizor @ Scizorite
Ability: Technician
EVs: 252 HP / 108 Atk / 28 Def / 116 SpD / 4 Spe
Adamant Nature
- Bullet Punch
- U-turn
- Swords Dance / Thief
- Roost
Mega Scizor's typing, along with great natural bulk and reliable recovery, makes it one of the best defensive answers to Mega Metagross. Its bulk allows it to easily setup with Swords Dance or threaten to 2HKO outright with a Technician-boosted Thief.
252 Atk Tough Claws Mega Metagross Zen Headbutt vs. 252 HP / 28 Def Mega Scizor: 35-42 (19.7 - 23.7%) -- possible 5HKO
252 Atk Mega Metagross Earthquake vs. 252 HP / 28 Def Mega Scizor: 45-54 (25.4 - 30.5%) -- guaranteed 4HKO
252 Atk Tough Claws Mega Metagross Meteor Mash vs. 252 HP / 28 Def Mega Scizor: 39-47 (22 - 26.5%) -- 15% chance to 4HKO
Even Mega Metagross's most effective move, Superpower, can't threaten this monster very much.
252 Atk Tough Claws Mega Metagross Superpower vs. 252 HP / 28 Def Mega Scizor: 71-84 (40.1 - 47.4%) -- guaranteed 3HKO
While in return, Mega Scizor can alternate between Roost and Swords Dance to get to +6 and 2HKO with Bullet Punch or just 2HKO with Thief.
108+ Atk Technician Mega Scizor Thief vs. 0 HP / 4 Def Mega Metagross: 80-96 (51.6 - 61.9%) -- guaranteed 2HKO
+6 108+ Atk Technician Mega Scizor Bullet Punch vs. 0 HP / 4 Def Mega Metagross: 80-94 (51.6 - 60.6%) -- guaranteed 2HKO
Mega Scizor is also excellent at gaining momentum vs. Mega Metagross, as it can easily U-turn out on a predicted switch.