This is my proposed Subway team for pokemon BW. Please rate moveset/pokemon/weaknesses.

Question

Limitations for the sets: I do not trade(unable), breed or go for perfect IV's. I only EV train and use items. Thus, hidden powers are not used.

SET A

Hydreigon @ Life Orb
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Superpower
- Surf
- Fire Blast
- Draco Meteor

Volcarona @ Life Orb
Ability: Flame Body
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Fire Blast
- Hurricane
- Bug Buzz
- Quiver Dance

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 252 Atk / 4 SpD
Brave Nature
- Power Whip
- Shadow Claw
- Gyro Ball
- Explosion

OR

SET B

Haxorus @ Life Orb
Ability: Mold Breaker
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Dragon Dance
- Earthquake
- Poison Jab
- Outrage

Chandelure @ Assault Vest
Ability: Infiltrator
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Psychic
- Energy Ball
- Fire Blast
- Shadow Ball

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 252 Atk / 4 SpD
Brave Nature
- Power Whip
- Shadow Claw
- Gyro Ball
- Explosion

Comments

Neither Haxorus nor Chandelure are very good, and the two Ferrothorns you have look identical, so you should just combine the two teams into one team of Hydreigon, Volcarona, and Ferrothorn. Replace Hydreigon's surf with roost to heal. Give Volcarona a lum berry so it can set up quiver dance on opponents that try to inflict status ailments. Replace its hurricane with giga drain to cover water and rock. Give Ferrothorn a leftovers and 252 HP/4 Def/252 SpD sassy for more bulk. Replace its shadow claw and explosion with leech seed and protect to heal more.

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Note that in every battle tree/subway/etc. that it A: will get harder & B: usually destroy sweeper teams (because they're usually frail) every guide i could possibly find for these say you should use balanced teams.

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Noted on that. The reason for Volcarona having hurricane is to counter fighting types which are a problem for both Hydreigon and Ferrothorn. Do you think I should still replace it.

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Fire blast already hits fighting types pretty hard. Giga drain is more useful than hurricane.

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Hydreigon @ Life Orb
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Superpower
- Roost
- Fire Blast
- Draco Meteor

Volcarona @ Life Orb
Ability: Flame Body
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Fire Blast
- Giga Drain
- Bug Buzz
- Quiver Dance

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 252 SpD / 4 Def
Sassy Nature
- Power Whip
- Shadow Claw
- Gyro Ball
- Explosion

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I still think you should give Volcarona a lum berry because thunder wave is pretty common and annoying. Ferrothorn is really a lot better at being defensive, so it appreciates having leftovers, leech seed, and protect. You should probably also use a naive Hydreigon instead of a timid one so its superpower will be stronger.