Smeargle @ Focus Sash
Ability: Own Tempo
EVs: 252 HP / 6 Def / 252 Spd
Timid Nature
- Spore
- Shell Smash
- Ingrain
- Baton Pass
Primary lead. Lead if no menace for two turn, then shell smash and baton pass to Mew and this white herb for cure the -1 in def and spe def. Shell smash is played in first for his speed boost, but if ingrain protect against the phazers. Take it if you are the time, otherwise it must recover by switching with a better defense.
Mew @ White Herb
Ability: Synchronize
EVs: 252 HP / 100 Def / 158 SDef
Bold Nature
- Barrier
- Amnesia
- Roar
- Baton Pass
Secondary lead with Gliscor - Mew for the def, Gliscor for the speed. Second link in the chain if everything is ok. Play roar for breaking another baton pass team or too strong boost opponent. According to the team in front, play barrier, amnesia or both. The attack level in OU is hight, also you can secure the team with a 2.5x or 3x def.
At the point, you can decide for pass to Smeargle for recover ingrain, pass to Vaporeon to protect against status attack with substitute, boost attack with Scizor or boost special attack with Togekiss. Rarely if you have 2x speed, boost speed with Gliscor.
Gliscor
Ability: Hyper Cutter
EVs: 236 HP / 42 Def / 232 Spd
Adamant Nature
- Agility
- Acrobatics
- Earthquake
- Baton Pass
Gliscor has two utility: protect the chain against menace and restart a broken chain with agility.
Scizor @ Leftovers
Ability: Technician
EVs: 252 HP / 60 Def / 196 Spd
Adamant Nature
IVs: 30 SDef
- Swords Dance
- Bullet Punch
- Bug Bite
- Baton Pass
Scizor protect the chain against menace, especially dark and psy type with Bug Bite, and boost attack if the chain is ok or for his own use.
Togekiss @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 62 Def / 196 Spd
Calm Nature
IVs: 30 Atk / 30 SAtk / 30 Spd
- Nasty Plot
- Air Slash
- Dazzling Gleam
- Baton Pass
Dazzling Gleam is great against dark type. Play nasty plot for own use of for the chain.
Vaporeon @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 128 Def / 130 SDef
Bold Nature
IVs: 30 Atk / 30 SAtk / 30 Spd
- Substitute
- Aqua Ring
- Hydro Pump
- Baton Pass
Subsitute is the main defense against status attack. Vaporeon is a good staller and create a 100HP clone.
In short, three potential lead to start the chain and four stall/sweeper as appropriate. It's not perfect, naturally, and i expect your feedback ;)
(and sorry for my english..)