Hey there, nice team.
Couple of suggestions I'd like to make would be changing Groudon to a Defensive set so you set up Stealth Rocks AND deal with EKiller. Here's an importable set if you want to try it out:
Groudon @ Leftovers
Ability: Drought
EVs: 248 HP / 16 Atk / 236 Def / 8 Spe
Impish...