Phantom's Gate brings with it, a "Hyper Metal Chain Deck." From this deck, we can already see a Dialga EX and Aegislash EX (both have unconfirmed additional effects, and Aegislash has an Ability to boot). Even Skarmory EX could be a choice. I'm hoping Phantom's gate will bring some usable Metal types in the Meta, and if it does, I feel that Plasma Klang might just re-debut. Personally, I think Phantom's Gate will need to introduce a form of energy acceleration for Metal types though, but if they do, Plasma Klang will more than likely become a Tier 1 deck. It seems that these sets for XY are focusing on reviving/helping established arche-types from BW, which is fantastic in my opinion. I'm hoping this thread can get updated and receive helpful input as more information is revealed.
Plasma Kling is King!
Plasma Kling is King!