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My prefered way to build Ray is building it with Zeraora GX and Shuckle.
Shuckle discards 3 energy straight out of the deck. This energy can be used in multiple ways, such as using Zeraora's GX attack to pack on 5 energy when you have 5+ in the discard, or it can be used so that when you play Rayquaza GX onto the bench, you have guaranteed energy in the discard pile already so the ability never misses.
I'm still trying to figure out what kind of back up strategy I want to play in the deck (Zinnia as a way to maintain momentum since Wishful Baton is rotating? Pikachu & Zekrom GX as a back up attacker and accelerator?), but here is currently the list I'm floating on.
Rayquaza GX x4 (Have to play 4 of them for the ability)
Zeraora GX x2 (Gives your whole board access to free retreat, massive energy acceleration. Back up attacker.)
Shuckle x2 (Supplies discard pile with energy rapidly to be used many ways)
Pikachu & Zekrom GX x1 (Back up attacker/energy acceleration. The GX attack is good for games you can take 3-5 prizes at a time to win)
Dedenne GX x1 (Bench sitter for draw power, when you need it)
Shaymin Prism Star x1 (Back up attacker)
Tapu Koko Prism Star x1 (Free energy acceleration and a back up attacker)
Latias Prism Star x1 (Good energy acceleration for when you have 3 Rayquaza GX on the board. Don't underestimate the 30 damage and colorless cost for attack)
Lillie x4 (Basically the best T1 supporter in the game right now, IMO)
Cynthia x4 (Draw power)
Erika's Hospitality x2 (Draw power)
Lisia x1 (Helps you tutor out hard to find cards, mostly Tapu Koko Prism Star and Thunder Mountain Prism Star)
Mysterious Treasure x4 (Discard outlet to put energy into the discard. Searches Ray GX and Latias Prism)
Poke Gear 3.0 x4 (A mandatory 4 of in basically every deck after rotation)
Cherish Ball x3 (Helps you find Ray GX, Zeraora GX, Pikachu & Zekrom GX, and Dedenne GX, but mostly the latter 3.)
Great Catcher x3 (Play these as Acro Bikes until this card releases. Acro Bike is decent deck acceleration)
Net Ball x2 (Searches for Shaymin Prism, Shuckle, or grass energy. Very versatile card for this deck)
Viridian Forest x3 (Discard outlet to supply more energy to the discard pile, but also making sure you always have energy to attach per turn)
Thunder Mountain Prism Star x1 (Allows Zeraora GX to GX attack for free and swing 160 for only 2 energy. Pikachu & Zekrom GX can attack for only 2 energy)
Energy x16 (I don't play any lower than 16 energy in Ray GX. I don't think any less is enough.)
Grass Energy x8
Electric Energy x8
This to me has been the most consistent way to play the deck. You don't clog yourself with Stage 1s or Stage 2s that brick you, and I often have 8-10 energy on the board by the end of turn 2, which is enough to OHKO all Tag Team GXs.
Of course playstyle is still a thing and not everyone will like this method. I'm still thinking about other ways to make Ray work since I think it has a lot of consistency options even after rotation.