Alright, haven't answered an RMT in awhile, but I'll try my best.
UberPwnage obviously will use Ice types, so take advantage of that and use moves and Pokemon that target the Ice weakness. Remember that it's an mono Ice team, meaning UP will almost definitely be using something we call a hail team.
Politoed: Nice. Conserve your Focus Blast PP for Abomasnow! :3 It will 2HKO Obama, which is nice.
Gorebyss: SmashPass? Nice. However, you should consider replacing Ice Beam, as Ice resists Ice. You can try something that hits Ice Pokes for Super Effective damage, like HP Rock. And replace Scald for Surf.
Rotom-W: I'd go for a Scarf.
Lanturn: Um....UP is using Ice types, right? Meaning...he has no Galvantula....
Anyway, I'd replace this guy for a Keldeo.
Keldeo-R @ Leftovers
Trait: Justified
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Substitute
- Calm Mind
- Surf / Hydro Pump
- Secret Sword
A basic SubCM set, and it really hurts. Substitute allows you to set up Calm Mind. Hopefully you know what Calm Mind does..., anyway, it basically does +1 SAtk, +1 SDef. Surf and Hydro Pump abuses STAB and Rain. Surf is used if you are an accuracy stickler, and Hydro Pump is used for the power. Secret Sword hits Physical Defense, STAB, and scores on them Ice types you're going to face.
If you insist on a cleric, you can replace Rotom-W with this guy.
Azumarill: No suggestions.
Kingdra: I'd replace this guy for a different Pokemon...
Cloyster (F) @ Focus Sash
Trait: Skill Link
EVs: 252 Atk / 4 Def / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Shell Smash
- Rock Blast
- Razor Shell
- Icicle Spear
Basic Cloyster Shell Smash set. Shell Smash lets you get +2 Atk and Spd. Rock Blast scores on UP's Ice types again, hitting them super effectively. Razor Shell is STAB and rain boosted. Icicle Spear is STAB and can still hurt the Ice types that resist it, or neutrally, like Mamoswine.
Importable:
Politoed (F) @ Leftovers
Trait: Drizzle
EVs: 252 HP/ 4 SAtk / 4 SDef
Calm Nature (+SDef,-Atk)
- Encore
- Scald
- Ice Beam
- Focus Blast
Gorebyss (M) @ White Herb
Trait: Hydration
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Scald
- Baton Pass
- Hidden Power [Rock]
- Shell Smash
Rotom-W @ Choice Scarf
Trait: Levitate
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Volt Switch
- Thunder
- Trick
- Hydro Pump
Keldeo-R @ Leftovers
Trait: Justified
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Substitute
- Calm Mind
- Surf
- Secret Sword
Azumarill @ Choice Band
Trait: Huge Power
EVs: 252 HP / 252 Atk/ 4 Spd
Adamant Nature (+Atk, -SAtk)
- Waterfall
- Aqua Jet
- Double-Edge
- Superpower
Cloyster (F) @ Focus Sash
Trait: Skill Link
EVs: 252 Atk / 4 Def / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Shell Smash
- Rock Blast
- Razor Shell
- Icicle Spear