Need help editing my team

Hey guys This is my first time trying to make an OU team, and I was looking for some tips in order to improve it The team at the moment is

Garchomp @ Garchompite
Ability: Rough Skin
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature

• Outrage
• Earthquake
• Swords Dance
• Iron Head

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 248 HP / 92 Def / 168 SpD
Sassy Nature
IVs: 0 Spe

• Gyro Ball
• Leech Seed
• Spikes
• Power Whip

Donphan @ Rocky Helmet
Ability: Sturdy
EVs: 248 HP / 252 Def / 8 Spe
Impish Nature

• Earthquake
• Stone Edge
• Rapid Spin
• Stealth Rock

Keldeo @ Life Orb
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature

• Scald
• Secret Sword
• Calm Mind
• Hidden Power [Fire]

Raikou @ Choice Specs
Ability: Pressure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature

• Volt Switch
• Thunderbolt
• Hidden Power [Ice]
• Shadow Ball

Talonflame @ Sharp Beak
Ability: Gale Wings
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature

• Brave Bird
• Swords Dance
• Flare Blitz
• Roost

Any way to help improve this would be appreciated :)