Six Paths of Pain (Dragon Team Support)

I am looking for support on how my team looks and what changes may benefit this team. Also any other advice you may have.

Politoed @ Leftovers
Trait: Drizzle
EVs: 252 HP / 252 Def / 4 SDef
Bold Nature (+Def, -Atk)
- Scald
- Toxic
- Encore
- Protect

Dragonite@Leftovers
Trait: Multi-Scale
EVs: 216 HP / 40 Def / 252 SAtk
Modest Nature (+SAtk, -Atk)
- Thunder
- Surf
- Roost
- Hurricane

Forretress@Ring Target
Ability: Sturdy
Relaxed Nature
252 HP/176 Def/80 SpDef
-Rapid Spin
-Stealth Rock
-Spikes
-Volt Switch

Gyarados @ Life Orb
Trait: Moxie
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature (+Spe, -SpA)
- Dragon Dance
- Waterfall
- Earthquake
- Ice Fang

Magnezone@Choice Specs
Ability: Magnet Pull
Modest Nature
208 HP / 252 SpA / 48 Spe
-Thunder
-Hidden Power Fire
-Volt Switch
-Flash Cannon

Haxorus@Choice Band (Deva Path)
Ability: Mold Breaker
Adamant Nature
36 HP / 252 Atk / 220 Spe
-Outrage
-Earthquake
-Superpower
-Dual Chop

How dose the team, move-set and EV training look, anything should be changed?

Reuniclus should be using max Defense because its physical defense is lower than its Special Defense and it it needs all of the physical bulk it can get.

Stone Edge is worth considering over Substitute for a little extra coverage.

Outside of Rain teams, Thunder's accuracy sucks. You really should use Thunderbolt instead.

Haxorus now has a stronger Fighting attack in Superpower, so it should go over Brick Break. Since Dragon + Ground already have good coverage, Dual Chop or Dragon Claw can go in the last slot for a more reliable STAB.

Is move-set of Dragonite alright? Also thanks for other info did make those changes.