What a great pokemon this is!

Now for some suggestions, which final move in the moveset seems to be the most effective?

Garchomp:
-Earthquake
-Dragon Rush
-Rock Slide
-*HELP*

I think "Dragon Dance" is great, but Garchomp doesnt really need it, I think an elemental, yet physical attack supports this pokemon. Ice types are taken by Rock Slide, so perhaps a fire or normal typed move can help support versatility....what do you all think?