What are your thoughts on this team /vp/?

Rotom-H @ Choice Scarf
EVs: 252 Spd / 252 SpA / 4 HP
Modest / Timid Nature
- Thunderbolt
- Overheat
- Volt Switch
- Shadow Ball / Trick

Hydreigon @ Life Orb / Assault Vest
EVs: 252 SpA / 252 Sp / 4 SpD
Timid Nature
- Dragon Pulse
- Focus Blast
- Dark Pulse
- Earth Power

Gyarados @ Lum Berry
Ability: Intimidate
EVs: 252 Atk / 252 Sp / 4 SpD
Adamant Nature
- Waterfall
- Ice Fang
- Dragon Dance
- Earthquake / Stone Edge

I already bred for a near perfect Hydreigon since I decided from the start I wanted to use one, do you think Gyara and Rotom supplement it well? I'd love to know before I start breeding for them. EV spreads/movesets subject to change btw--I'm more concerned at this moment with choosing the right Pokemon