It's been mentioned in conjunction with Grist, the Hunger Tide, which, when exiled with the Cauldron, turns all of your creatures with +1/+1 counters into pseudo-Planeswalkers with Grist's loyalty abilities
The deck has Akroma's Will and Swords to Plowshares, and that's pretty much it
Sure, there will be new Pokmon to surprise them, and perhaps the gym formula will be refreshed, but it wont blow their mind
In unlimited mode, any cards are allowed, however the unlimited mode has been restricted to only be a playable option with online friends in a Friend Battle or training against a NPC
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The Pokmon recently introduced a new mechanic, both the Single Strike Style and Rapid Strike Style cards