Crobat - 6HKO
Xatu - 6HKO
Gliscor - 6HKO
Skarmory - 3HKO
Gyarados (with Intimidate) - 3HKO
Dragonite (with Multiscale)
Salamence (with Intimidate) - 3HKO
Slowbro - 5 or 6HKO
Celebi - 3 or 4HKO (depending on the set)
Mew - 5 or 6HKO
Reuniclus - 3HKO
Latias - 3HKO
While they're all used in OU, some are more suited to UU (Xatu & Crobat), so I would suggest:
Gliscor
Dragonite
Salamence
Celebi
Latias
Gilscor @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP, 76 Def, 180 Speed
Nature: Impish/ Jolly
- Toxic
- Protect
- Substitute
- Earthquake
Celebi @ Leftovers/ Life Orb
Ability: Natural Cure
EVs: 252 Sp. Atk, 252 Speed
Nature:
- U-Turn
- Psychic
- Giga Drain
- HP Ice/ Nasty Plot
Dragonite @ Life Orb
Ability: Multiscale
EVs: 252 Sp. Atk, 252 Speed, 4 Atk
Nature: Naive/ Hasty
- Hurricane
- Thunder
- Extreme Speed
- Roost
NB: this is a rain sweeper set
Salamence @ Lum Berry
Ability: Intimidate/ Moxie
EVs: 252 Atk, 252 Speed, 4 HP
Nature: Jolly
- Earthquake
- Dragon Claw
- Dragon Dance
- Aqua Tail/ Fire Fang
Latias @ Leftovers
Ability: Levitate
EVs: 252 HP, 252 Speed, 4 Sp. Atk
Nature: Timid
- Calm Mind
- Subtitute/ Psyshock
- Dragon Pulse
- Roost
However, if you really want to status Infernape, I suggest either Slowbro or Xatu.
Slowbro @ Leftovers
Ability: Regenerator
EVs: 252 HP, 252 Def, 4 Sp. Atk
Nature: Relaxed
- Thunder Wave
- Slack Off
- Scald
- Psychic
Xatu @ Leftovers
Ability: Magic Bounce
EVs: 252 HP, 240 Sp. Def, 16 Speed
Nature: Calm
- Thunder Wave
- Roost
- U-Turn
- Psychic/ Night Shade