I just thought of a really good team!
Kyogre @ Choice Scarf, Timid Nature. Water Spout, Surf, Thunder, and Ice Beam. Timid Ogre is OP.
Rayquaza @ Life Orb, Jolly Nature. Dragon Dance, Outrage, V-Create, and Extremespeed. I have seen many people use V-Create + Dragon Dance, and I can understand why! The two work so well together!
Blaziken @ Chesto Berry, Jolly Nature. Flare Blitz, Rest, Hi Jump Kick, and Protect. As the opponent desperately tries to whittle down Blaziken while Flare Blitz destroys them, mean old Chicken has a nasty surprise: Chesto-Rest! The cycle continues as our opponent can do nothing but sob quietly in the corner.
Giratina-A @ Choice Scarf, Timid Nature. Draco Meteor, Aura Sphere, Dragon Pulse, and Shadow Ball. The element of surprise! Giratina has an underrated base 100 special attack (higher than that of Kingdra) and outruns & Revenges the likes of Darkrai and Mewtwo.
Any other pokemon you saw on the ladder and feel would make a good addition to our team? Let's make a great team!