Offensive Sweeper - Garchomp.
Mixed Sweeper - Electabuzz.
Revenge Killer - Infernape.
Garchomp @ Choice Band
Ability: Sand Veil
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature (+ Spe / - SpA)
- Outrage
- Earthquake
- Stone Edge
- Dragon Claw
Outrage and Earthquake for STAB, Stone Edge is for Lugia, and Dragon Claw is good for revenge kill move as it doesn't you lock you into using it.
Electabuzz @ Life Orb / Leftovers
Ability: Static
EVs: 4 Atk / 252 SpA / 252 Spe
Naive / Hasty Nature (+ Spe / - SpD or + Spe / -Def, respectively)
- Thunderbolt
- Hidden Power Ice / Hidden Power Grass
- Cross Chop
- Substitute / Psychic
Thunderbolt for STAB, Hidden Power Ice gives the best coverage alongside Thunderbolt, hitting Donphan, Tangrowth, Altaria, etc, Hidden Power Grass hits Quagsire, Rhyperior, Lanturn, etc, Cross Chop is for Chansey, Substitute for scouting (I suggest using Leftovers if you use Substitute) and Psychic deals more damage to Nidoqueen, Venusaur, Nidoking, etc.
Infernape @ Choice Scarf
Ability: Blaze
EVs: 64 Atk / 252 SpA / 192 Spe
Naive Nature (+ Spe / - SpD)
- Fire Blast / Overheat / Flamethrower
- Close Combat
- Hidden Power Ice
- U-turn / Grass Knot / Stone Edge
Fire Blast for STAB (Overheat is another option as you will be switching a lot, and Flamethrower is more reliable), Close Combat is to kill Blissey and Snorlax, as well another STAB option, Hidden Power Ice is to revenge kill Salamence, Latias, etc, U-turn is good for scouting and damages Starmie, Grass Knot is good for bulky Waters, and lastly Stone Edge is decent for revenge killing Gyarados.