If you want to be a bit more conservative, Calamity Storm is such a great move that has no contrary effects on Roaring Moon rather than removing the stadium in play, but you should plan a deck with this attack in mind, having plenty of stadiums only to discard them afterward
Weavile is an obvious top choice when deckbuilding for Expanded, punishing any and all abilities on either side of the field this not only targets GX Pokemon, but EX, V, and VMAX Pokemon as well
But in our perfect world, we'll manage to hideaway either Titan of Industry or Toxrill, the Corrosive, two of the most expensive and powerful creatures in all of Standard, either of which can win the game more or less by itself
(If a permanent with a stun counter would become untapped, remove one from it instead.) Omega, Heartless Evolution Rarity: Uncommon TYPE: Legendary Artifact Creature SUBTYPE: Robot CMC: 7 Mana cost: USD: $0.50 EUR: 0.54 TIX: 0.06 EDHREC RANK: 9495 (8/8) Wave Cannon When Omega enters, for each opponent, tap up to one target nonland permanent that opponent controls