Mew berry abuser baton pass
Mew @ Salac Berry/Liechi Berry/Petaya Berry
EVs: 252 HP / 4 Spd / 252 Spe
Timid Nature (+Spd, -Atk)
- Swords Dance/Nasty Plot/Rock Polish
- Baton Pass
- Taunt/Magic Coat/Stealth Rock
Salac Berry:Raises Speed by 1 stage at 25% HP
Liechi Berry:Raises Attack by 1 stage at 25% HP
Petaya Berry:Raises Special Attack by 1 stage at 25% HP
Point of this set: Set up a +2 move than keep using substitute until the berry activates so Mew can pass +2 +1 to another pokemon. Taunt and Substitute stops both phazing moves and Dragon tail but Magic Coat can be used to beat faster stuff/Pranksters with taunt. Stealth Rock can also be used to provide rocks for the team. Mew usually has trouble with the standard baton pass set as it's trapped with only 4 moves and often needs dual screens to work. This set fixes that as the berry is like a 5th move boosting move. Not to mention Mew appreciates taking U-turns from scizor/genesect so it can activate the berry quick and pass a +2 and +1 easy. Mew will pretty much enjoy taking any hard hit like Latio's specs Draco Meteor which will leave Mew at less than 25% activating the berry. Examples of pokemon that would enjoy +2 speed and +1 Atk/SpA are Genesect and Moxie Salamence, while pokemon that would enjoy +2 Atk/SpA and +1Spe are Terrakion, Garchomp, Volcarona, Tornadus-T, Latios etc.
Counters: Prankster pokemon if Mew is not using Magic Coat, Phazing moves such as Haze, Perish song, Roar if Mew is not using Taunt.
This set works in UU, OU or Ubers pretty much.
Btw feel free to take this idea and make your own analysis (don't feel like writing it in the correct format)