The other day I played fatkid123 (Tord?) on the ladder using 5 stage 2s (Decidueye/Gardevoir/Swampert/Solgaleo/Meganium + Alolan Ninetales). I thought that was weird but then a few games later I played some other person using the exact same deck. This person didn't hide their deck, so I copied it onto my account real quick so the Pokemon and energy counts were as follows:
3-3 Decidueye GX
1-1 Gardevoir GX
1-1 Solgaleo GX
2-2 Swampert
2-2 Meganium
3-2 Alolan Ninetales GX
2 Tapu Lele GX
1 Super Boost
3 Double Colorless
1 Rainbow
2 basic Fairy
As far as I can tell, it's a Decidueye/Ninetales deck with splashed-in stage 2 lines of Gardevoir and Solgaleo with the help of Meganium. I guess the Gardevoir allows you to have a really strong sweeper that you can sprout into play whenever the time is right since Meganium allows you to bench a Ralts and evolve into a Gardevoir on the same turn. Solgaleo is just good to have to eliminate weaknesses and provide energy acceleration, though you only run 7 total energies so I don't know how relevant that part is.
Can't tell if this is just a meme or for reals, but I went 1-1 against it.
I mean the current viral sensation in the PTCG community is Shintaro's Meganium/Swampert/Greninja/Slaking deck right? And that deck runs 1 energy. What ends up happening is you establish multiple Swamperts (with Meganium's help) early to build your hand to some insane size, then you just go ham with these stage 2s that are too big to knock out. Yeah I agree it's super clunky or slow at first, but stage 2s are currently the best they've ever been. Granted I've been too busy (nor do I have a copy of Solgaleo GX) to try this madness out, but here's the full list to give it a whirl if you have the cards, and I really want to hear what you think of it if you end up playing a few games:25 pokemon ... this deck has to brick constantly, especially if the meganium doesn't show up early on. You've got three outs in your starting hand - Chikorita AND Meganium, Tapu Lele, or Alolan Vulpix; anything else and you're probably going to just sit there for turn after turn.