In Gen7, Thousand Arrows/Waves will be available at the MT for a large amount (45 or so, each) of evolutionary lines, because why would we ever get Imperfect Cell or Perfect Cell. Er. Zygarde 15% or 100%.
i doubt it thousand arrows gives one the best coverge in game easily able to replace EQ and break half the metagame without trouble if only zygarde gets it still its enough to bring it to OU form BL