Mew @ Tanga Berry
Ability: Synchronize
EVs: 120 HP / 200 SpD / 188 Spe
Timid Nature
IVs: 0 Atk
- Will-O-Wisp
- Amnesia
- Soft-boiled
- Taunt
Vivillon:
Taunt T1 then Amnesia, Will-O, and Amnesia some more while Taunting.
252 SpA Vivillon Hurricane vs. 120 HP / 200 SpD Mew: 117-138 (31.5 - 37.1%) -- 79.9% chance to 3HKO
252 SpA Vivillon Hurricane vs. +2 120 HP / 200 SpD Mew: 58-70 (15.6 - 18.8%) -- possible 6HKO
etc.
Even if they get confuse hax and you have to drop the taunts, burn makes their normal game plan basically impossible.
Gyarados-Mega:
Taunt then Wisp and continuously Taunt.
116+ Atk Gyarados-Mega Waterfall vs. 120 HP / 0 Def Mew: 151-178 (40.7 - 47.9%) -- guaranteed 3HKO
116+ Atk burned Gyarados-Mega Waterfall vs. 120 HP / 0 Def Mew: 75-89 (20.2 - 23.9%) -- guaranteed 5HKO
Genesect:
Amnesia twice and then Soft-Boiled. Amnesia again when you can and Soft-Boiled when you need to. Bug Buzz SpD drops can be annoying but are fine unless you get really unlucky. You can Wisp at some point ig, but it's not a to priority.
252 SpA Choice Specs Genesect Bug Buzz vs. +2 120 HP / 200 SpD Tanga Berry Mew: 87-103 (23.4 - 27.7%) -- 81.9% chance to 4HKO
252 SpA Choice Specs Genesect Bug Buzz vs. +4 120 HP / 200 SpD Mew: 116-138 (31.2 - 37.1%) -- 69.9% chance to 3HKO
252 SpA Choice Specs Genesect Bug Buzz vs. +6 120 HP / 200 SpD Mew: 86-104 (23.1 - 28%) -- 82.3% chance to 4HKO
Here comes team Charm! Does Wisp count as a Fire move for your challenge?