At Gryphon Games & Comics, we play two formats for our Pokemon events.
This is the format typically played at our Sunday Pokemon League. This includes the last 30 sets worth of cards, dating back to around 2011. This means you and your kids can play with sets that are a little older, not just the newest ones.
Standard events only allow cards that have been released in the last couple of years. This includes:
Sun & Moon sets
These sets change each year as the formats evolve.