I agree with using Paradancing Groudon, but I don't think we should use the standard EVs. 200 Atk and Adamant specified so that Groudon can OHKO the standard Lugia at +2 after it takes SR damage. However, we're not going to be running SR on this team so 200 Atk EVs seems like a waste. Instead, we should use 252 Atk for maximum offensive power. Then HP should be maxed out (and I can't figure out why you wouldn't max it out on the standarard set, anyway) to maximize overall bulk and allow Groudon to take 5 Seismic Tosses, thanks to Leftovers. Even with less physical bulk than the standard set, Groudon can still take a +1 LO Jolly Rayquaza's Outrage after taking damage from 1 layer of Spikes and being healed with 1 turn of Leftovers recovery.
tl;dr: This should be the Paradancing Groudon set.
Groudon @ Leftovers
EVs: 252 HP/252 Atk/4 Def
~ Swords Dance
~ Thunder Wave
~ Stone Edge
My Trick Room team peaked at 6th out of 2668
in the Wi-Fi ladder on Pokemon Online.
Originally Posted by Fat Squid Ninja