A Stadium that helps slow down the game and an Energy that works better on a slow metagame.
I really like the Battle Subway! It feels like a nice way to nerf streaming of those big EXs. Hive Energy looks absolutely beautiful - you did a great job on it once again! Despite the creative possibilities, I personally think Hive Energy is going to have a few problems from a technical point of view. The ability for any Pokemon being able to use any Pokemon's attacks can easily make broken combinations, or at least combinations that are potentially very powerful. A few I could think of right now in official PTCG:
Spinda PRC + Unfezant AT: Use Unfezant's Feather Dance and then attack with Spinda's Uproar to do 90 damage to everything. Perhaps unviable though.
Any Omega Barrage Pokemon + a powerful attack: Potentially take two KOs a turn!!
Alpha Growth Pokemon could make some attacks way too easy to set up and effectively break them (potentially Mewtwo-style attacks).
Malamar XY Promo + any "flip a coin, this Pokemon can't be damaged" style attacks.
Politoed FFI + any highly [C] attack: attacks for no energy.
Noivern FFI, Dragonite-EX, could also get particularly powerful.
In your set:
Cloyster + Powerful attack (potentially)
Empoleon + any highly [C] attacks
It also needs to have a clause like this: (You still need the necessary Energy to use each attack.)
By the way, while looking back through your set, I noticed Aerodactyl is missing a word in its PokeBody.