Well Blissey completely owns CM Ghost Arceus :P Yeah Rayquaza is cool, it sweeps a lot. Your team really hates Zekrom spamming Bolt Strike, especially those Scarf variants :(
Hoping for Thunder miss? :(
A bit weak to Kyurem-W once Kyogre goes down :( Also the team really hate Spikes.
EDIT: How the hell did Excadrill outsped my +1 Rayquaza? Must be some Air Lock glitch. I am thinking of ditching someone for Groudon :P Maybe Kyogre or Deoxys-S but I am not sure, losing Kyogre means we lost something to check Kyurem-W. Kyogre can take an attack and paralyse it. Deoxys-S provides Spikes which is useful.