Pokémon has announced the new rules, format, and regulations for all sanctioned Video Game tournaments in the 2015 season.
All battles will be played with the Pokémon Omega Ruby and Pokémon Alpha Sapphire video games, will be standard Double Battles, and most of the Pokémon in the National Pokédex are permitted. To make sure a Pokémon is permitted, check for a blue pentagon on its summary page, underneath its image.
The new format rules take affect starting January 1, 2015 and will be used throughout the year, including at the World Championships in Boston, MA in August. So make sure to start practicing with the new rules and get your teams in shape for the upcoming Regional Championships and Premier Challenges that will take place throughout the year.