What the pokemon do:
Jumpluff
Can take any hit from a Celebi and KO back with Z-bounce.
Jumpluff outspeeds and OHKOs Roserade with Z-Bounce
Jumpluff outspeeds and OHKOs Trevenant with Z-Bounce
Abomasnow
Abomasnow outspeeds Jumpluff and OHKOs with Blizzard
Abomasnow outspeeds and OHKOs Shiftry
Abomasnow lives any hit from Scarf Shiftry and OHKOs back with Blizzard
Abomasnow outspeeds and lives a hit from non-speed boosting nature Scarf Abomasnow and 2HKOs with HP-Fire
Roserade
Roserade outdamages and beats Mega-Venusaur with Specs Extrasensory.
Roserade can KO Abomasnow with Specs HP-Fire
Roserade can take a hit from and KO Scarf Leavanny
Roserade can take a hit from a non-special attack boosting nature Scarf Abomasnow and KO back with HP-Fire