The origins of this team were created by one of smogon's top ladder players, mien. After starting to use it, mien and I discussed various possibilities and tried different team members until we finally came up with similar Teams with differences which suit each other's play styles the best. On this RMT, I will analyze the differences so the readers may have their own insights on what functions the best (the differences in mien's team will be in bold). The team presents as the following:
Abomasnow @Leftovers
Trait: Snow Warning
EVs: 252 HP / 4 SpA / 252 SpD
Nature: Sassy
Blizzard
Leech Seed
Substitute
Focus Punch
Abomasnow is a very misunderstood Pokémon most of the times. Having a whopping 7 weaknesses, it is often cast aside without much thought. Yet more skilled battlers know the true purpose of Abomasnow: to wall the ever-common Water / Ice or Electric/Ice combinations used by the likes of Suicune, Starmie, Cressilia, Magnezone, Raikou and a counter to the metagame's many walls. With a Sassy Nature and no Speed IVs, it takes minimum damage from Gyro Ball and enables Hail to prevail over Sandstorm at the beggining of the battle. Focus Punch is a superior choice over Earthquake for numerous reasons, like having much greater PP for stalling CM Suicune or Cressilia, and when intelligently hidden from the set (like when stalling Bronzong, using Blizzard, lading the opponent into believing the last move is Grass Knot) it can prove deadly against Tyranitar, allowing the Hail to overtake the Sandstorm.
Garchomp @Leftovers
Trait: Sand Veil
EVs: 252 HP / 16 Atk / 148 Def / 92 Spe | 252 HP / 16 Atk / 240 Def
Nature: Adamant
Earthquake
Dragon Claw / Crunch
Fire Blast
Stealth Rock
This is what makes the team different from most hail teams - the use of a bulky Garchomp spread. It makes a fine Tyranitar counter and a good switch into Heatran early-game to provide Stealth Rock support. I use Dragon Claw as I don't have trouble with Gengar, while mien can take it down on the switch with Crunch (or take a Shadow Ball). 92 Speed EVs enable for 263 Speed, outspeeding Jolly Breloom (which mien has a sure-fire counter to) and most Tentacruel, which like to stay in to Ice Beam a predicted SD. It makes a good switch into a Lucario's SD, as no Lucario will risk a Close Combat, since Garchomp would obviously be faster (which it is not).
Walrein @Leftovers
Trait: Ice Body
EVs: 252 HP / 252 Def / 4 Spe
Nature: Bold
Blizzard
Protect
Substitute
Roar
A staple of any hail team worthy of the name. Everyone fears the mighty Stallrein and its virtually infinite Sub / Protect (virtually as it lasts 32 turns maximum, which adds up exactly 200% of Hail damage, meaning that any all-out offensive Team will lose two team members to it). However, its usefulness doesn't end there. It has great HP and good Defense, taking 46% tops from an Adamant max Attack Garchomp and OHKOing back with Blizzard (even if it has Yache) with Hail damage, making it an incredible counter. Just so you know how bulky it is, it can survive a LO Adamant max Attack Lucario's Close Combat around 60% of the time. Roar is prefered to Toxic as the team has TS support and it screws up anything setting up.
Spiritomb @Leftovers
Trait: Pressure
EVs: 252 HP / 64 SpA /192 SpD
Nature: Calm
Calm Mind
Dark Pulse
Rest
Sleep Talk
And this is where the major difference stands. While I use a CM STalking Spiritomb, mien uses an Iron Defensive Spikes Deoxys-E. I personally prefer Spiritomb for being a sure-fire counter to Gengar, Deoxys-E and absorbing Hypnosis, as well as screwing over stall. This really needs some lead-off SpD to counter the said, so this spread is superior to max Defense Bold. It has happened before that Spiritomb was the last Pokémon, so the opponent was unable to phaze it, and thus it swept the remaining pokes. Also, an anti-spinner is gladly welcomed.
_______________________________
Deoxys-E @Leftovers
Trait: Pressure
EVs: 252 HP / 136 Def / 84 SpA / 36 Spe
Nature: Bold
Psychic
Iron Defense
Spikes
Recover
And this is mien's walling Deoxys-E. It is able to switch into Lucario or Gyarados with impunity, doubling its Defense to force a switch and start setting up the Spikes. It is because of said Lucario and LO Gyarados with Stone Edge that mien carries this thing around, in expense of no sleep absorber or anti-spinner. 84 SpA EVs allow it to OHKO Gengar and 36 Spe allow it to outspeed AgiliGross after one Agility and Iron Defense. It makes a great choice regardless, as while I have to play around Lucario and Gyarados and have bigger problems with offense, mien needs to worry about Gengar and opposing stall teams.
Mamoswine @Choice Band
Trait: Snow Cloak
EVs: 4 HP / 252 Atk / 252 Spe
Nature: Adamant
Earthquake
Ice Shard
Stone Edge
Bite
CBed Mamoswine wrecks incredible havoc endgame. Its typing makes it a good switch into the likes of Zapdos (which stall Abomasnow out of Blizzards like nothing) and its CBed Earthquake in the OU environment is second in might only to Rhyperior (along with Garchomp's). This is in what mien relies to revenge-kill Gengar, as a CBed Ice Shard does from 63% to 74%. Bite is mostly filler, but it may catch Cressilia switch-ins unexpectedly, as well as Gengar ones. In a pinch, its 20% flinch rate has proven useful against Celebi.
Tentacruel @Black Sludge
Trait: Liquid Ooze
EVs: 252 HP / 60 SpA / 88 SpD / 108 Spe | 204 HP / 96 SpA / 172 SpD / 36 Spe
Nature: Calm
Surf
Blizzard
Toxic Spikes
Rapid Spin
The swift switch into the Toxic Spikes this Team hates so much. Provides Rapid Spin support against stall and the Toxic Spikes come in handy to help Walrein do its job. My spread strays from standard, so let me explain: the 60 SpA allows for a OHKO on Salamence with Blizzard, as this can survive a Specs Draco Meteor and outspeed DD Mence before one Dragon Dance. The 108 Speed EVs makes it hit 263, outspeeding Breloom. Max HP to take the only Focus Punch it will ever be able to fire off, as Spiritomb takes the sleep and, from there, nothing on the Team will allow it to set up a Substitute but said Spiritomb, which only comes much later on the battle.
So... this is it. Hail is an offensive type of stall, made to suit the current metagame. Yet this Team is much more than putting up a Sub with Abomasnow on the switch to Heatran and firing of Focus Punch early-game, as wearing it down with Leech Seed and switching with a recovery may change the outcome of the battle. I play slightly more offensively than mien, however, as the Team may give away, so my strategy against offensive teams is to play more offensively (like making sacrifices) until the time for Walrein to come in arrives. We were able to reach such a high place on the ladder by being open to try new Pokémon, not simply using Weavile or Froslass because they are Ice Types. The team isn't, obviously, everything, as the way we play with it makes all the difference, as stated above.
Abomasnow @Leftovers
Trait: Snow Warning
EVs: 252 HP / 4 SpA / 252 SpD
Nature: Sassy
Blizzard
Leech Seed
Substitute
Focus Punch
Abomasnow is a very misunderstood Pokémon most of the times. Having a whopping 7 weaknesses, it is often cast aside without much thought. Yet more skilled battlers know the true purpose of Abomasnow: to wall the ever-common Water / Ice or Electric/Ice combinations used by the likes of Suicune, Starmie, Cressilia, Magnezone, Raikou and a counter to the metagame's many walls. With a Sassy Nature and no Speed IVs, it takes minimum damage from Gyro Ball and enables Hail to prevail over Sandstorm at the beggining of the battle. Focus Punch is a superior choice over Earthquake for numerous reasons, like having much greater PP for stalling CM Suicune or Cressilia, and when intelligently hidden from the set (like when stalling Bronzong, using Blizzard, lading the opponent into believing the last move is Grass Knot) it can prove deadly against Tyranitar, allowing the Hail to overtake the Sandstorm.
Garchomp @Leftovers
Trait: Sand Veil
EVs: 252 HP / 16 Atk / 148 Def / 92 Spe | 252 HP / 16 Atk / 240 Def
Nature: Adamant
Earthquake
Dragon Claw / Crunch
Fire Blast
Stealth Rock
This is what makes the team different from most hail teams - the use of a bulky Garchomp spread. It makes a fine Tyranitar counter and a good switch into Heatran early-game to provide Stealth Rock support. I use Dragon Claw as I don't have trouble with Gengar, while mien can take it down on the switch with Crunch (or take a Shadow Ball). 92 Speed EVs enable for 263 Speed, outspeeding Jolly Breloom (which mien has a sure-fire counter to) and most Tentacruel, which like to stay in to Ice Beam a predicted SD. It makes a good switch into a Lucario's SD, as no Lucario will risk a Close Combat, since Garchomp would obviously be faster (which it is not).
Walrein @Leftovers
Trait: Ice Body
EVs: 252 HP / 252 Def / 4 Spe
Nature: Bold
Blizzard
Protect
Substitute
Roar
A staple of any hail team worthy of the name. Everyone fears the mighty Stallrein and its virtually infinite Sub / Protect (virtually as it lasts 32 turns maximum, which adds up exactly 200% of Hail damage, meaning that any all-out offensive Team will lose two team members to it). However, its usefulness doesn't end there. It has great HP and good Defense, taking 46% tops from an Adamant max Attack Garchomp and OHKOing back with Blizzard (even if it has Yache) with Hail damage, making it an incredible counter. Just so you know how bulky it is, it can survive a LO Adamant max Attack Lucario's Close Combat around 60% of the time. Roar is prefered to Toxic as the team has TS support and it screws up anything setting up.
Spiritomb @Leftovers
Trait: Pressure
EVs: 252 HP / 64 SpA /192 SpD
Nature: Calm
Calm Mind
Dark Pulse
Rest
Sleep Talk
And this is where the major difference stands. While I use a CM STalking Spiritomb, mien uses an Iron Defensive Spikes Deoxys-E. I personally prefer Spiritomb for being a sure-fire counter to Gengar, Deoxys-E and absorbing Hypnosis, as well as screwing over stall. This really needs some lead-off SpD to counter the said, so this spread is superior to max Defense Bold. It has happened before that Spiritomb was the last Pokémon, so the opponent was unable to phaze it, and thus it swept the remaining pokes. Also, an anti-spinner is gladly welcomed.
_______________________________
Deoxys-E @Leftovers
Trait: Pressure
EVs: 252 HP / 136 Def / 84 SpA / 36 Spe
Nature: Bold
Psychic
Iron Defense
Spikes
Recover
And this is mien's walling Deoxys-E. It is able to switch into Lucario or Gyarados with impunity, doubling its Defense to force a switch and start setting up the Spikes. It is because of said Lucario and LO Gyarados with Stone Edge that mien carries this thing around, in expense of no sleep absorber or anti-spinner. 84 SpA EVs allow it to OHKO Gengar and 36 Spe allow it to outspeed AgiliGross after one Agility and Iron Defense. It makes a great choice regardless, as while I have to play around Lucario and Gyarados and have bigger problems with offense, mien needs to worry about Gengar and opposing stall teams.
Mamoswine @Choice Band
Trait: Snow Cloak
EVs: 4 HP / 252 Atk / 252 Spe
Nature: Adamant
Earthquake
Ice Shard
Stone Edge
Bite
CBed Mamoswine wrecks incredible havoc endgame. Its typing makes it a good switch into the likes of Zapdos (which stall Abomasnow out of Blizzards like nothing) and its CBed Earthquake in the OU environment is second in might only to Rhyperior (along with Garchomp's). This is in what mien relies to revenge-kill Gengar, as a CBed Ice Shard does from 63% to 74%. Bite is mostly filler, but it may catch Cressilia switch-ins unexpectedly, as well as Gengar ones. In a pinch, its 20% flinch rate has proven useful against Celebi.
Tentacruel @Black Sludge
Trait: Liquid Ooze
EVs: 252 HP / 60 SpA / 88 SpD / 108 Spe | 204 HP / 96 SpA / 172 SpD / 36 Spe
Nature: Calm
Surf
Blizzard
Toxic Spikes
Rapid Spin
The swift switch into the Toxic Spikes this Team hates so much. Provides Rapid Spin support against stall and the Toxic Spikes come in handy to help Walrein do its job. My spread strays from standard, so let me explain: the 60 SpA allows for a OHKO on Salamence with Blizzard, as this can survive a Specs Draco Meteor and outspeed DD Mence before one Dragon Dance. The 108 Speed EVs makes it hit 263, outspeeding Breloom. Max HP to take the only Focus Punch it will ever be able to fire off, as Spiritomb takes the sleep and, from there, nothing on the Team will allow it to set up a Substitute but said Spiritomb, which only comes much later on the battle.
So... this is it. Hail is an offensive type of stall, made to suit the current metagame. Yet this Team is much more than putting up a Sub with Abomasnow on the switch to Heatran and firing of Focus Punch early-game, as wearing it down with Leech Seed and switching with a recovery may change the outcome of the battle. I play slightly more offensively than mien, however, as the Team may give away, so my strategy against offensive teams is to play more offensively (like making sacrifices) until the time for Walrein to come in arrives. We were able to reach such a high place on the ladder by being open to try new Pokémon, not simply using Weavile or Froslass because they are Ice Types. The team isn't, obviously, everything, as the way we play with it makes all the difference, as stated above.