I've been thinking, and Shaymin has been such a huge part of deck building for so long, I really don't know what people will do. If Shaymin rotates, i'm sure Octillery will too. Not to mention, what about VS Seeker and Trainer's Mail? Or N? Or Sycamore? Or Acro Bike? We haven't been seeing many viable alternatives to these things. Tapu Lele is great, but when N and Sycamore rotate, what is it gonna search? Alolan Sandslash simply doesn't have the numbers and is a Stage One. Bewear is also Stage One and would require Deevolution Spray to use effectively. I think decks that want to use their GX attack ASAP (think Solgaleo) will benefit from Hala late game, but what about the all-important quick set up? Maybe Burning Shadows will have something. Or maybe the meta will completely shift. My point is that when Shaymin, VS Seeker, Sycamore, and all of those kinds of cards rotate, the meta will shift more than it did when these cards were released in the first place. I think the next rotation will be the most meta-shifting in a long time. I mean, what would you do without Shaymin? Think about it. It's inevitable that Shaymin will rotate. Where the meta will be after the fact is what I want to know.