In later games, their uses would expand to covering different kinds of terrain - thereby allowing players to acquire secret items/locations - as well as chocobo racing
These decks are a mix of Pokmon cards (the primary characters used for battle), Trainer cards (which provide various supportive actions and items), and Energy cards (necessary for powering Pokmons abilities)
Some legendary creatures will be making a shift down in rarity, as well, though Verhey did not say which
To briefly summarize their strengths: Bilbo is your choice if you want to focus purely on Lifegain since he increases the potency of all your lifegain cards and then doubles as a finisher for the deck
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This archetype has a ton of buffs that apply across your board, meaning that one small Merfolk can end up being a big problem