I'm planning on entering the Genration Showdown in ORAS, and I read up on the likely threats. Top of the list were Mega Rayquaza and Primal Groudon. After seeing this, I decided to throw away my planned Mega Kangaskhan team because I knew it stood no chance. I instead built this little team (condensed so that the question wasn't too long):
Rayquaza@ Life Orb
EVs: 252 Atk / 252 Spe / 4 HP
Dragon Claw / Extreme Speed / Dragon Dance / Dragon Ascent
Groudon@ Red Orb
EVs: 252 HP / 252 Atk / 4 Def
Precipice Blades / Fire Punch / Bulk Up / Stealth Rock or Stone Edge
Togekiss@ Leftovers
EVs: 252 Spe / 252 HP / 4 SDef
Roost / Dazzling Gleam / Follow Me / Thunder Wave
I am looking for a good fourth member of the team, preferably with access to Fake Out and works well in a Doubles format. I was planning on defensive Fairy Arceus, but he's banned :'( I also can't use Mega Khan or Mega Lopunny for my Fake Out user. Please offer any suggestions!