I ain't gonna yap about Dragapult ex since it's a pretty well established deck in the meta and will be further established come rotation. This deck has worked pretty well from my testing so if you want a basic Dragapult ex deck to start with and then optimize go ahead and use this one. I do highly recommend using exp share since it acts as a 2nd sparkling crystal if you already have a Dragapult ex set up and there are not a lot of scenarios were exp share fails and it just makes it easier to chain phantom dives. Pokegear also works better for me personally over tatsugiri since you don't need to spend resources getting that tatsugiri on the board and into the active with the risk that it will do absolutely nothing and die whereas pokegear can just be played whenever and also has the minor benefit of looking at an extra card which can be pretty important. Hawlucha is another good addition for the deck since you don't have to waste 2 phantom dives on those 70hp mons and can instead just get aggressive and knock them out immediately which is easier to do when they're item locked by a 30hp plant. Hawlucha is also good for teal mask ogerpon ex which is once again good for aggression since you can go and revenge kill an ogerpon against something like raging bolt if they kill your active Pokémon which will happen about 99% of the time unless they become raging bulk. And yeah that's about all the lesser used cards that I'm using in this Dragapult ex list, and if your wondering why I've got it all blinged out, it's because why not 🤑
Also if your gonna use this in the current meta please use manaphy at least, you will die to radiant greninja or regidrago vstar, this is a Post rotation focused list after all because I couldn't find my radiant alakazam irl so I just made a post rotation list instead
(Also I'm using +1 psychic energy because it makes getting budew in the active easier and also makes powering up Dragapult ex easier without having to go grab earthen vessel or Crispin)