Competitive Team HelpHaving trouble with your competitive Pokémon team? Be sure to check here if you need any help on it. Any teams intended for in-game and casual play should be posted in the In-Game Team Help sub-forum.
Don't use the ongoing discussion prefix please - that's only for me to use :) nevertheless this fits in Competitive Team Help rather than here so imma move this there. I don't really play OU anymore so I don't have anything really to add but good luck!!
It might be a better idea to give some of your Pokemon Protect in a VGC environment since you have some multi-targeting moves (VGCs are double battles). Set-up moves are rarely seen in VGCs due to the fast pace there.
Rock Slide is the better option on Garchomp and Terrakion to hit both opponents. Give both Protect over Swords Dance. Give Terrakion Quick Attack for priority, or Quick Guard to protect against priority (over EQ).
Volcarona likes having the freedom to switch moves, since its current set doesn't have the best coverage. It might be a better idea to use this:
-Hidden Power (Ground/Ice)/Rage Powder
EVs: 4 HP/252 SAtk/252 Spe
Item: Focus Sash
I'd add more, but I'm on my phone now, so I might add more when I get back on my computer.