ok so, right now you have a team that Weavile and Mamoswine can devastate without breaking a sweat. and items are one of the most important factors in building a moveset for any pokemon... here are my suggestions:
Dragonite @ Leftovers
Trait: Multiscale
Jolly Nature (+Spe, -SAtk)
EVs: 252 Spe/ 252 Atk/ 4 SDef
- Dragon Claw
- ExtremeSpeed
- Superpower/Earthquake
- Roost
Tanks hits with Multiscale and Leftovers. Dragon Claw was chosen over Outrage to allow Dragonite to Roost in times of danger. Superpower is for covering Ice types and Steel type that resist Dragon Claw and ExtremeSpeed, but the Atk/Def drop does limit Dragonites staying power. Earthquake is better coverage and allows Dragonite to hit Steel types, at the cost of having a solid answer to Ice type threats.
Kryurem-B @ Choice Scarf
Trait: Teravolt
Adamant Nature (+Atk, -SAtk)
EVs: 252 Atk/ 252 Spe/ 4 HP
- Outrage
- Freeze Shock
- Earthquake
- Fusion Bolt
with base 90 Spe and 170 Atk, Kyurem-B just screams "Scarf me!!". Teravolt is unfortunately next to useless but Dragon/Ice/Ground/Electric moveset gives great coverage and allows Kyurem-B to revenge kill a large portion of the tier without much effort.
No Altaria! use Haxorus! i would say Salamence but you already have a Scarfer in Kyurem-B.
Haxorus @ Life Orb
Trait: Mold Breaker
Jolly Nature (+Spe, -SAtk)
EVs: 252 Spe/ 248 Atk/ 12 SDef
- Earthquake
- Swords Dance
- Dragon Claw
- Superpower/Dual Chop
LifeDance set. Swords Dance chosen over Dragon Dance to allow one turn setup. Dragon Claw doesn't end in confusion, so it was chosen over Outrage. Earthquake is coverage. Superpower can break through most Steel and Normal types that might wall you, but Dual Chop is always an option if you struggle with Substitute users.
Garchomp @ Choice Specs
Trait: Rough Skin
Timid Nature (+Spe, -Atk)
EVs: 252 Spe/ 186 SAtk/ 72 HP
- Fire Blast
- Draco Meteor
- Focus Blast
- Earth Power
most people expect a Physical set when they face a Garchomp, so this set uses Specs to catch them off guard and punish their lack of forethought. With Specs and Timid Nature Garchomp can outspeed most things that lack a Scarf, sans Gengar, Alakazam, and Weavile, and STAB Draco Meteor with Specs boost puts a serious dent in almost everything that doesn't resist it not named Blissey or Chansey.
Latios @ Life Orb
Trait: Levitate
Modest Nature (+SAtk, -Atk)
EVs: 252 SAtk/ 148 Spe/ 116 HP
- Psyshock
- Dragon Pulse
- Thunderbolt/Surf/Fire Blast
- Roost
Since Soul Dew isn't available in Gen V yet, we have to go with Life Orb. This set uses Roost to mitigate Life Orb damage and Psyshock, Dragon Pulse, and Thunderbolt with Modest Nature to blast away anything that can't outspeed it. we didn't invest max in Spe to add some Bulk for Roost to abuse, but it should prove sufficient to take out Scizor, Conkeldurr, Skarmory, and Volcarona. Surf and Fire Blast are alternatives to Thunderbolt, but both run the risk of having Gastrodon or Heatran switched into them.
Rayquaza is Ubers so.... we may still have a place for Sally on this team.
Salamence @ Life Orb
Trait: Moxie
Naive Nature (+Spe, -SDef)
EVs: 252 Spe/ 194 SAtk/ 62 Atk
- Draco Meteor
- Outrage
- Earthquake
- Fire Blast
MixMoxMence FTW. kicks butt.
hope this helps :)