Just beat gaia wings and caught Arceus yesterday night with this team:
Infernape Lv.56
Flare Blitz
Close Combat
Secret Power
Mach Punch
OHKOd quite a few GAIA WINGS pokemon with this :)
Magnezone Lv.57
Discharge
Mirror Shot
Magnet Rise
Thunder Wave
Caught basically all my legendaries with this thing. Thunder wave works great; Arceus barely attacked at all after I used it. Discharge hit all the plates (except earth, of course) :)
It's load of resistances also helped with shielding against judgment.
Torterra Lv.56
Wood Hammer
Crunch
Earthquake
Synthesis
2nd Pokemon I used on Arceus. Withstood several hyper beams. Earthquake worked great.
Swampert Lv.55
Surf
Earthquake
Strength
Dive
1st Pokemon used against Arceus. Surf and Earthquake both worked nicely. (Magnezone was 3rd)
Weavile Lv.56
Ice Shard
Night Slash
Brick Break
Slash
Used this to (try to) sweep Lance's team and to sweep Lucas's team. For some reason choice band doesn't lock your move, but it may or may not power it up.
Gallade Lv.54
Leaf Blade
Psycho Cut
Close Combat
Swords Dance
Used in emergencies. Forgot to put him in my party when fighting Arceus, but nothing really bad happened.
I now need to grind to prepare for the Torxia League.
Earlier, I grinded Magnezone and Torterra at Sootopolis; Swampert and Gallade at the Tree of Origin; and Infernape and Weavile on Ruby Path. I think I'll need better grinding places now.