Ok so I had quite a few battles with that team and I am already getting some results. I intend to test it more but still. Support Cloyster actually works with Chansey support. It walls every physical attacker except Zekrom. RP Groudon fails to do anyhting and is 2HKOed by Icicle Spear. But I think Ice Shard should be used over Tspikes. I always found myself setting up T Spikes and actually got wrecked once by SD Ray. So yeah..it might pay off.