EZ Fairies

I love the Baby Trio card too, but setting it up this way is going to take forever. If you want to use Gardevoir & Sylveon to set it up, I would recommend using Penny (Scarlet & Violet)[or Acerola (Burning Shadows)] and Hero's Cape (Temporal Forces) to tank hits, whilst stopping your opponent's Boss's Orders with Ribombee (Lost Thunder). Include 1 Counter Catcher (Paradox Rift) so you can bring up something with 120 HP or less before using the GX move, therefore assuring victory.

As for the rest of the deck, it needs more draw supporters, and more Pokemon search items. I would instantly cut all the Special Energy, Energy Searches and Energy Switches. Pidgeot line could probably be reduced to 3-1-3 or even 2-0-2 with 3 Rare Candy. I would also recommend playing a higher count of your Tag Teams (2 of each) and eliminating Hisuian Heavy Ball.

As for additions, Cynthia (Ultra Prism) and Iono (Paldea Evolved) are solid Supporter cards, and probably more useful in this deck than Professor's Research as they retain important cards for later in the game. Ultra Ball (Scarlet & Violet) is one of the most versatile Pokemon search cards, and while the discard costs can be painful, they are worth it in the long run. As the game goes on, finding the 16th Energy could be difficult, so Night Stretcher (Shrouded Fable), Super Rod (Paldea Evolved) or Klara (Chilling Reign) can help you get over the line.

Sorry for the lengthy response, but I think with some of these changes the deck will instantly improve. I miss the Fairy types so much, I'm very glad to see somebody still playing them. Good luck with the deck, hope this helped!

StallDecksRule I believe that the best way to get it powered up is through PoGo Blastoise and UMI Axew since it can't be gusted, or a gimmick setup using FCO Mew and Electrode-GX.

CountyGibbon798 I agree! Those are very effective methods for setting up Supreme Puff. I have spent many hours messing around with the Electrode version myself. However, I didn't really want to say 'Scrap your deck, here play this list' when I think the deck can be improved, and potentially work on a casual level. (I am unsure of the setting MRGN is intending on playing the deck, perhaps a stronger build is necessary?)

StallDecksRule I think I might suggest to the site to add an additional setting to when you post your deck to saw what kind of environment it should be played in, with some examples being casual/tabletop, gimmick/semi-meta, or tournament-level. Sure, it would still work on an honour system for when Little Timmy throws together the traditional "everything that says 'Charizard' in it plus 25 energies is super OP guys!!" deck and labels it as such, but it could help filter things out.