This is an old hail team starring some trite and some underestimated members, the whispers of Generation V before X and Y comes out
Tree (Abomasnow) (M) @ Expert Belt
Ability: Snow Warning
EVs: 252 Atk / 174 SAtk / 84 Spd
- Ice Shard
- Wood Hammer
- Focus Punch
- Hidden Power [Fire]
Ubers Reject (Kyurem-Black) @ Leftovers
EVs: 216 Spd / 176 Atk / 52 SAtk / 64 HP
- Dragon Claw
- Fusion Bolt
Crimson Streak (Latias) (F) @ Leftovers
EVs: 252 HP / 252 Spd / 4 SAtk
- Calm Mind
- Dragon Pulse
- Hidden Power [Fire]
Stegomastodon (Donphan) (M) @ Leftovers
EVs: 252 HP / 4 SDef / 252 Def
- Head Smash
- Stealth Rock
- Rapid Spin
Mr. Ed (Keldeo-Resolute) @ Choice Scarf
EVs: 252 Spd / 252 SAtk / 4 SDef
- Secret Sword
- Icy Wind
- Hidden Power [Electric]
Iron Mantis (Scizor) (F) @ Life Orb
EVs: 252 Atk / 252 HP / 4 SDef
- Bug Bite
- Bullet Punch
The team itself, though by definition a hail team, and can function as one if need be, is more often then not potent as an anti-weather team. In a meta-game where monsters such as Thundurus, Volvarona, Venusaur and Landorus run rampant, hail, a weather only the somewhat common Kyurem-B and Alakazaam and the rare Cloyste, Reuniclus and Mamoswine tolerate, is the only truly reliable anti-weather weather so to speak. Not only do these mentioned threats loose their power under the icy skies, but they now face a barrage from pokemon able to stomach the cold, a distinct advantage. There are many other advantages as well, but those are more pokemon specific and will be covered below.
Now I probably like abomasnow more than most people. I look past its awful seven weaknesses, mediocre stats and poorly maintained moustache and I see two things: An effective weather setter and A Pokemon with superb luring ability. The first is obvious because of its ability, but it is the combination of its seven weaknesses, wide movepool and lack of use that makes it effective at the latter. Focus Punch is the quintessence of this. With it, pokemon such as Air Balloon Heatran, Kyurem, Specially Defensive Tyranitar and Blissey, all three thinking they can just waltz in, find themselves unconscious or on the brink of fainting as soon as they switch in. In tyranitar's case the opponent not only loses a potent threat but also the weather war. Hidden Power Fire serves a similar purpose luring and destroying threats like Scizor and Ferrothorn, making life easier for the rest of team, most notably Kyurem-B. Wood Hammer, in addition to being ridiculously powerful, is a more consistent response to Tyranitar, and is perfect for nailing the other weather starters (except Ninetales). Ice Shard is the means of making speedier threats, most notably Alakazaam, think twice. Alakzaam is also mentioned because Magic Guard makes it immune to hail, which is a nuisance. The Expert Belt further substantiates Abomasnow's role as a lure, and is used over Life Orb because I desire to maintain the passive damage advantage.
This is pretty much the standard Kyurem-B substitute set, except with Blizzard over ice beam. In this way, Kyurem-B is the primary abuser of my team's chosen weather, which as stated above is more of a counter-strategy than a core feature. At any rate the substitute set is highly effective in hail in that it allows Kyurem-B to almost always have the passive damage advantage, and to ensure that this is the case, Leftovers is the item of choice, especially as roost is not present for recovery. Dragon Claw over outrage because once locked into outrage, Kyurem B can easily be revenged killed by a good portion of the offensive tier if not behind a sub, and who could forget ferrothorn, against leech seed variants the passive damage advantage can be lost. Not to mention iron barbs. Fusion Bolt is standard fare, and completes the boltbeam combo. Substitute is for turning former checks, such as Breloom and Keldeo, into sitting ducks, as well as avoiding status, thereby maintaining the passive damage advantage.
Latias, in addition to completing the incidental double dragon offensive core, is the primary check to rain and sun alike, and more importantly the primary answer to Keldeo (other than my own). Its the standard Calm Mind set for Latias, allowing me to potentially lure more of the burdensome steels with Hidden Power Fire, which is also nice for Venusaur. Dragon Pulse is the standard reliable STAB, while Roost is standard recovery. Leftovers counteracts passive hail damage and potentially gives Latias the passive damage advantage.
Yeah I know I've been preaching the "passive damage advantage", but I kind of said "Screw it. I don't like Volcarona and I don't like Gengar waltzing in to block my Rapid Spins, so I'll Head Smash them into oblivion." Speaking of which, Rapid Spin is essential for the hazard weak team in my efforts to win the weather war, preserve my star pokemon, and maintain "the passive damage advantage". Earthquake is the obvious stab move the scares the living day lights out of this team's favorite foe heatran, and last but not least, Stealth Rock helps me maintain, you guessed it, the passive damage advantage. And you'll never guess why I run Leftovers.
8000 characters, what a pity