I've narrowed it down to two Pokemon. Gliscor and scyther. They will be baton passing to,
Azelf @ Focus Sash
252 Atk / 252 Spe / 4 HP
The sets I'd give the baton passers are below.
Gliscor @ Toxic Orb
Scyther @ Eviolite
Their EV spreads, natures, and move sets are identical
252 Def / 252 SpD / 4 HP
+ SpD - Atk or SpA
Lastly, it HAS to be this moveset, unless you can find a much better one.