From Shofu's playthrough: Serra had at least this:
Glaceon-Icy Wind, Blizzard, Snow Cloak
Abomasnow- Snow Warning,
Mamoswine - Snow Cloak,Rock Slide, Earth Power
Jynx - Dry Skin, Energy Ball, Psychic, Blizzard
Walrein - Ice Body, Leftovers, Aqua Tail, Stockpile
Froslass, Snow Cloak, Shadow Ball
I'd suggest the following:
Glaceon @ BrightPowder
Ability: Snow Cloak
EVs: 248 HP / 8 SpA / 252 SpD
Calm Nature
- Blizzard
- Icy Wind
- Wish
- Barrier
Stalling
Jynx (F) @ Focus Sash
Ability: Dry Skin
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Fake Out
- Psychic
- Blizzard
- Energy Ball
Fake Out is useful and the other three moves provide great coverage.
Mamoswine @ BrightPowder
Ability: Snow Cloak
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Rock Slide
- Earthquake
- Ice Shard
- Stealth Rock
Earthquake>Earth Power, Ice Shard for priority, Stealth Rock to set up.
Froslass (F) @ Focus Sash
Ability: Snow Cloak
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hail
- Blizzard
- Shadow Ball
- Destiny Bond
Hail to reset the weather if Obama dies and the weather is changed. The rest is pretty standard.
Walrein @ Leftovers
Ability: Ice Body
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
- Stockpile
- Blizzard
- Surf
- Rest
Rest cancels status, Surf synergizes with Jynx, hits multiple opponents, and is buffed by Sp.Atk so Blizzard can be used.
Abomasnow @ Abomasite
Ability: Snow Warning
EVs: 248 HP / 8 Def / 252 SpA
Modest Nature
- Blizzard
- Protect
- Giga Drain
- Light Screen
always died on the first turn when Shofu played, so Protect comes in handy. Mega on the turn after Protect to instantly cancel out any weather from the first turn.