Well, for Garchomp, I agree that it is better than Electivire since I've used one on my team with great success. And Garchomp knows Surf, so maybe you can try this set:
Garchomp @ Life Orb
EVs: 16 Atk/252 SAtk/240 Speed
Naughty Nature
- Swords Dance
- Draco Meteor
- Earthquake
- Surf
Surf can...