These are my guesses for what the two hype cards might look like:
Emolga V - Lightning - 160HP
Basic Pokémon
Ability: Fly High
When you play this Pokémon from your hand onto your Bench during your turn, you may discard a Supporter card from your hand. If you do, use the effect of that card as the effect of this ability. You can't use more than 1 Fly High Ability each turn.
[C] Bounce 30
Switch this Pokémon with one of your Benched Pokémon.
Weakness: [L] x2
Resistance: [F] -30
Retreat: 1
Oleana
Supporter
Switch 1 of your opponent's Benched Pokémon with their Active Pokémon.
You may play only 1 Supporter card during your turn (before your attack).
Emolga V is basically a Lt. Surge that requires you to use a bench spot to use it (instead of being behind on prizes) and with Oleana in format, it makes it a bit more of a risk than it would now in UPR-SSH. Of course Emolga being the representative is entirely a guess (it's just my favorite pikaclone), but something with this effect could be any one of the small, adorable, and especially squishy Pokémon. This effect cutting through the turn 1 Supporter rule would make it a core staple in all decks (as per the hype), but could be potent enough that it would be preemptively banned in Expanded. It's possible they could also limit an effect like this to only be usable if you haven't used a Supporter card during your turn, but that would drastically drop the utility of the card.
What I call Oleana could just as easily be Chairman Rose, but I think they might save the Chairman for some other effect. Guzma was just insanely potent and a little too useful. I don't think they'll reuse that effect and are much more likely to use the Lysandre-style gusting effect like I've included for the theoretical Oleana.