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I think Calm Mind would be a better option over Tail Glow this way you can Calm Mind + Rest Stall Sp. attackers like -2 Dialga or anything like that. Also I really think you should replace Ice Beam or Stealth Rocks with Taunt on Deoxys-s, this way you can shut down other lead Deoxys-s which...
Why not add Shed Shell over Leftovers on Skarmory so it can't be trapped by Magnezone, and you could change the ev spread to 252 Hp / 56 Defense / 200 SpD with Careful nature giving it better defense stat that reaches 330 and it still has a good Special Defense stat as well. This lets you take...