Stone all is a better title since stone can be a verb :) How does extremekiller arceus get walled by a giratina without wow or roar!? Surely you need it to have the wall set. It seems a waste of a pokemon by sacking a wall and then still struggle to beat arceus. Willowisp on arceus can also help too. You may want SE on ttar as I see that ho-oh can give this team a headache if it subs on your drill.
Computer back up!
The end of gyara...
Trickroom: yeah Gyarados isn't that great in Ubers. Try Jellicent maybe, since it worked out great for me. Gyarados kinda lacks recovery and bad stats which is horrible.