I've actually been trying to find an optimal partner for Silvally GX since I feel that it's an attacker that has potential in the upcoming format.
When you look at two of the BDIF candidates right now, Rayquaza and Nagandel/Stakataka, it would be incredibly favorable to play something like, oh, Silvally GX/Sylveon GX and roll Psychic Memory or Fire Memory. Sylveon casually OHKOs Rayquaza GX (and UNGX), and Silvally GX with Psychic Memory casually OHKOs Naganadel GX, even with Stakataka GX in play. Sylveon GX's Magical Ribbon grants automatic consistency, and you have access to both a strong offensive GX attack and utility GX attack. Now that I thought of this...I'm actually going to work on a list right now.
I can see reason for playing Silvally GX in the list, but you run into the problem of getting him out of the active when you actually want to go in with UNGX. Yes, Altar of the Moone can get discarded by your opponent, but quite frankly you aren't going to put it down unless you are actually going to retreat with it on your turn. At the very least you'll get the same value as Switch out of it, and if you get 2 or more turns out of it you get more net value than Switch. The fact that you're trying to charge Silvally GX up with 3 basic energy is another issue. You're not going to bother using Malamar ability on it when the energy to damage ratio you get out of UNGX is much higher with Malamar. I'd say Silvally GX is only viable in a DCE deck. 3 Basic energy is too slow for it.
When you look at two of the BDIF candidates right now, Rayquaza and Nagandel/Stakataka, it would be incredibly favorable to play something like, oh, Silvally GX/Sylveon GX and roll Psychic Memory or Fire Memory. Sylveon casually OHKOs Rayquaza GX (and UNGX), and Silvally GX with Psychic Memory casually OHKOs Naganadel GX, even with Stakataka GX in play. Sylveon GX's Magical Ribbon grants automatic consistency, and you have access to both a strong offensive GX attack and utility GX attack. Now that I thought of this...I'm actually going to work on a list right now.
I can see reason for playing Silvally GX in the list, but you run into the problem of getting him out of the active when you actually want to go in with UNGX. Yes, Altar of the Moone can get discarded by your opponent, but quite frankly you aren't going to put it down unless you are actually going to retreat with it on your turn. At the very least you'll get the same value as Switch out of it, and if you get 2 or more turns out of it you get more net value than Switch. The fact that you're trying to charge Silvally GX up with 3 basic energy is another issue. You're not going to bother using Malamar ability on it when the energy to damage ratio you get out of UNGX is much higher with Malamar. I'd say Silvally GX is only viable in a DCE deck. 3 Basic energy is too slow for it.