Once I started working on a Ice/Hail Team. At first, I thought it was more of a novelty team to use, since I used very "weak" Pokémon, but then, it wasn't that bad after all. A little luck hax here and there were great, especially. Still, my ice team evolved very much since its beginnings, and now its even harder to take down.
♦ Abomasnow (Yeti) @Focus Sash
• Protect
• Leech Seed
• Earthquake
• Blizzard
Since Abomasnow is my lead, it does great with Focus Sash. Protect is there for scouting choice item users or something that looks fishy. Leech Seed is obviously there for the pseudo-hazing and Earthquake provides great type coverage along with the 100% accurate-STABed Blizzard.
♦ Mamoswine (Snoinker) @Lum Berry
Ability: Snow Cloak
• Stealth Rock
• Blizzard
• Ice Shard
• Earthquake
Stealth Rock is a very handy move. Not suitable for a Mamoswine, but Mamoswine does force out a lot of switches, so there's were I typlically use it. Blizzard is only for those physical walls with low special defense. Skarmory gets 2KOed with the right EVs, which I provided. Hippowdon, Donphan and Gliscor get heavilly beaten when they try to switch-in. Ice Shard is for Dragonite, Garchomp, Salamence and other weakened Pokés. A Mamoswine's Earthquake is one of the most powerful in the game. Second to Rhyperior's and tied with Garchomp's, so that move is a must on the moveset.
♦ Dewgong (Frostbite) @Chople Berry
Ability: Thick Fat
• Disable
• Encore
• Perish Song
• Aqua Jet
This Dewgong is supposed to be my physical and special wall (mostly special). Since my team is a Hail-based team, it has a great weakness to fire attacks. A special mention goes to Typhlosion, who has a STABed Eruption that is usually coupled with a Choice Scarf. I've lost to him one time, but with Dewgong, that is no longer the problem. Dewgong has Thick Fat, so he comes in easly on him. Then, Aqua Jet weakens Typlosion's Eruptions which is the priority on this set. Chople Berry just gives him life insurance so that he can Encore a Fighting attack (if that happens, I'll switch-in Froslass), or just survive your typical Close Combat to which I'll take advantage and Aqua Jet. Perish Song is meant for the pseudo-hazing since my team does have Spikers.
♦ Froslass (Arctica) @Life Orb
• Taunt
• Spikes
• Shadow Ball
• Blizzard
Froslass has much potential with this set. The idea is to get a Blissey in, in which I will Taunt. Blissey, having nothing to do, switches out and I set up Spikes. Froslass is weak without Life Orb, so it had to be included in this set. Shadow Ball and Blizzard both get STAB and Life Orb powers its offense power even more.
♦ Walrein (Icebreaker) @Leftovers
Ability: Icy Body
• Protect
• Roar
• Toxic/ Surf
• Blizzard
Walrein, in the past, had Cloyster to set up Toxic Spikes. Toxic Spikes worked well with Protect, Icy Body and Hail, but Cloyster's awful HP kept it from being on my team. The purpose of this set is to shuffle Toxic/Toxic Spikes as well as heal Walrein. Its my physical wall on this team, so it can shuffle really well. However, I'm currently switching back and forth from Toxic to Surf, seeing which one proves more useful. Toxic is my first choice though. Blizzard just gets STAB. I also just use one Leftovers, so I don't see why your typical "Stallrein" is bad on this team.
♦ Weavile (Icee) @Life Orb
• Taunt
• Pursuit
• Brick Break
• Ice Punch
Taunt nullifies Skarmory's purpose, as well as Blissey's so I thought it can do well on Weavile. Since most Ghosts and slower Psychics switch out when Weavile comes in, Pursuit tells them otherwise. Brick Break had to be included for the fear of Heatran, Blissey, Lucario, etc. Ice Punch gets STAB, but has rather weak base power, so Life Orb is a must on a Jolly Weavile.
So if I had a chance to become a gym leader online, I would choose an Ice team that has support from Hail. :-)