This is where Professor Antiqua's Vitality or Sandfur ex come in very handy, as they allow you to attach energy cards to Furious Flash ex under certain circumstances
You have to duel two Silfer Reds, KENYoU and Sigthor, who were bribed to duel for improvements in the Red Dorm
We can expect to see the First Partner Pokmon from Gen 3 (Treecko, Torchic, Mudkip), Gen 6 (Chespin, Fennekin, Froakie), and Gen 9 (Sprigatito, Fuecoco, and Quaxly)
But its fun, and I like fun
Hydrapple ex From Stellar Crown Ability: Ripening Charge Once during your turn, you may attach a Basic [G] Energy card from your hand to 1 of your Pokmon
You wouldnt run it as a replacement Thundurus, but if you had a Raichu deck and Thundurus was prized or you just cant get it, there are worse options than this attack