Hold your horses. While some indicators point towards Sun/Moon increasing in popularity, your guess is pretty high. There are a lot of scenarios here. The first indicators (preorders, growing interest in the series etc.) might be inflated. People who usually buy first day or first week might now preorder, that would inflate preorders without really increasing sales. Also sales could be more frontloaded, meaning more first week sales but weaker legs.
I think it is somewhat safe to assume that it will outsell X/Y, but that fast might be a stretch.







