Hey! Coming from someone who plays Solgaleo (albeit in expanded with Bronzong), I kind of see a bit of a problem: You don't have a very reliable way to recover Energy. The thing I like about playing Leo in Expanded is that because Bronzong exists, you have a very reliable way to recover/accelerate energy, thus making it so Sunsteel Strike consistently one-shots just about everything. Sure, Solgaleo Prism gets Energy back onto the field, but is reliant on your opponent having more benched Pokemon, which can be problematic late game. Here are some things I would suggest:
1. Dusk Mane Necrozma GX: This is one of my favorite cards in my version of Leo, as it's a nice 220 damage beatstick with a great GX attack for when you're behind. The 4-Energy attack cost isn't great, but is still doable, and it at least gives you another option over just using Leo. I'd say -1 Solgaleo GX (4 is complete overkill), +1 DM Necrozma GX.
2. Baby Dusk Mane Necrozma: This is one of a few cards that I would very much love to play in Leo, as it is quite honestly an amazing card. You noted that Solgaleo (and, if you decide to include it, DM Necrozma GX) don't one-shot things very well, requiring a Choice Band to KO higher-HP Pokemon. Baby Dusk Mane's first attack is amazing, doing 60 damage to an EX/GX of your choice, for only a single Metal Energy. This means you can easily take out that Metagross that your opponent just switched to the bench, or whatever else. It's second attack can come in handy if you find yourself in a very tough situation, dealing a heavy 200 damage if your opponent has only 1 Prize left. Not exactly something you'd want to lead with, but definitely a very nice tech. I would honestly recommend 1, possibly even 2 of these, as they could come in handy. I'd take out the Solgaleo from Guardians Rising, as Dusk Mane is far more superior, and doesn't require evolution. -1 Solgaleo, +1 DM Necrozma promo.
Some other ideas:
- Solgaleo's GX attack is great for early-game energy acceleration, but can cause problems for you later, which is why I almost never use it. If I do use it, it's usually late game, or because I want to keep the GX attack for Dusk Mane for emergencies. I'd use it only if you need to, but keep in mind that it can hurt you later.
-Mysterious Treasure really isn't great in this deck. The only Psychic Pokemon you have are Leles + Cosmog/Cosmoem, which really doesn't help. I'd maybe consider dropping them, maybe in favor of 1 more Vulpix, but that's up to you. Also, consider dropping Cosmog to 3, as you don't always need 4.
-As I noted earlier, one thing your deck seems to lack a bit is Energy Recovery. The thing that makes Leo a great Pokemon is the ability to just hit for a lot of damage, and switch to the bench. Sure, Mt. Coronet does get energy into the hand, but you then have to spend a couple of turns trying to attach Energy manually, or use Solgaleo Prism, which gives your opponent time to get set up, or potentially disrupt your plays. Back when Sun and Moon first was released, people used Lurantis as a way to accelerate energy back onto Solgaleo. Maybe consider using it as a way to get energy back onto Leo(s) faster than just manually attaching.
-Super Boost Energy isn't great. I played it in Lunala and Solgaleo, but getting the 3 Stage-2 Pokemon isn't quite worth the effort. Sure, it can be a very easy way to get a free one-shot on something with Leo, but doesn't really help too much.
Anyway, that's about all I can think of for now. If you have any questions, please don't hesitate to ask!
Thanks,
-Alpha
