This would be so funny if someone ran Choice Specs Arceus with Ice Beam to troll... but meh *gets serious*
Skarm + Zek = something never heard of, also my win ratio against syrim is like 5:1 so I lose 5 out of every 6 battles we play, I don't know if you'd want to trust me with now, BUT Sub claws zekky is what I think is probably expected of everyone. Running Mix sounds like a good idea from my perspective (crushes Groudon), hmm I wonder if Syrim's reading this lol. Skarm + Gira-a form a solid wall core, add Chansey and you've got everything BUT Zekrom taken care of. A dialga takes care of that so it should be pretty easy to get phazing started so
I think a semi-stall team using Skarm + Gira-a defensive core, a Dialga lead / BU Dialga to divert the Zekrom weakness, with a chansey (sponges them special hits) should work. After all the phazing Zekrom can get an easy clean with a scarf set (needed to divert problems with Mewtwo)
Whadya think?