I thought we'd been in XY-on for a while, but it sounds like the most recent regionals were still standard 2014-2015? Or were they Extended, and Standard is currently XY-on? Thanks!
Is this still a thing? I was under the impression that no one does this anymore.Some regionals also do a Standard-Expanded style play, meaning that the first half is standard and top cut is expanded. As Ms Hugo said though, it widely varies where you are at.
https://www.pokemon.com/us/play-pokemon/pokemon-events/find-an-event/
Pokémon's official Event Locator should tell you everything you need to know. The tournaments that come up should specify whether which format, but if they don't, it provides the TO's contact information.