I want to like Amazing Raikou. It reads like it's on the cusp of great potential. a 1-Prize Pokemon that can put 240 damage ON THE BOARD for nothing more than a wonky attack cost (no "damage to all your Pokemon", no self-mill, no coin toss, no extra conditions. Just "if you have the energy, it works").
Vikavolt decks or Rayquaza-GX seems like the go-to for it. My biggest concern is that, Vikavolt has consistency issues, but can otherwise fulfill 2/3 the attack cost once it's going.
And Rayquaza-GX is usually all about blowing up whatever is in front of it.
So it begs the question: what is Raikou useful for in either of these decks exactly? 120 damage up front these days isn't much. An additional 120 damage to the bench CAN be good sniping off weird stuff, but for the most part, you're either taking pot shots at 2-3 Prize Pokemon or sniping off easy Basics and getting 1 Prize anyway. Unless the deck caters toward that sort of Energy acceleration, it seems it can only set up math for future KOs, or it's used as a late game finisher if you set damage up beforehand. But it also comes off as a heavy-handed way of pulling off a niche-game finisher. Vikavolt and Rayquaza-GX were all about blowing up whatever is Active. Amazing Raikou goes against this.
Additionally, there's the "it can snipe Shaymin-EX", but I'm of the belief that a banlist change is more effective against Shaymin-EX. If you don't think Shaymin-EX will get banned, fight me.
I think AR Raikou is pretty good w/out Vikavolt. Turbo Patch, Max Elixir, and Tapu Koko Prism Star honestly feel like enough to set 1-2 up T1, maybe even a third, which honestly should be all you need, given Shaymin-EX exists in the format. You always have manual attachments too, so a fourth and given pokemon retrieval, a possible 5th. Cards like FFB and Electropower also let you hit higher numbers too, which fix some 2HKOs. A lot of decks with thiccer Pokemon like TTs and VMAXs don't play Mew/Mr. Mime/Machoke, so worrying about not being able to hit the bench shouldn't be a huge problem. Of course, if they do, that's a big oof. Play a tech Silent Lab is all I can say there (except for Machoke).
I don't think Shaymin-EX will get banned. They don't normally, if ever, ban cards for making the format too fast. In the end, it all depends on how fast they want their format to be. EVEN IF Shaymin-EX is banned, give it like 5 sets from now and we'll just be back here with maybe say, a Lumineon V that while is much needed in standard for the speed it brings, would be """"busted"""" in expanded due to it's speed, especially when combined with X card. So then they'll ban that, or no, would they ban the card that "makes it busted"? Nobody had complaints about Shaymin-EX before Scoop Up Net, just saying. I don't think either card deserves a ban, since I think currently their only thing with bans is "do you at least get 1 turn to play the deck?" and NO, donk shouldn't be included in this. Even then, I still honestly feel banning Latios-EX or Pheromosa-GX works better. But the reason why I'm saying don't include donk when talking about Shaymin-EX/Scoop Up Net ban is because it's not exactly unviable, but definitely not a deck I'd ever bring to a bigger tournament, unless I'm expecting like ONLY Roweggs or something. Sure in bo1s this deck rocks, but since when will they ban a card for not being fun to play with with your friendos, lol.
Another thing to think about. A lot of the T1 hand lock strategies wouldn't be NEARLY as good without Shaymin-EX. Not to say you couldn't do it, but definitely not as good as they were.