A Nintendo Direct Mini was broadcast on January 11th, 2018 and details about the Pokkén Tournament DX Battle Pack was announced. Wave 1 will be available January 31st, 2018 and Wave 2 will be available March 23rd, 2018.
Nintendo Download, Jan. 11, 2018: Build Before You Buy!
The Battle Pack is now available for purchase in Nintendo eShop on Nintendo Switch, and includes two Waves of Battle Pokémon and Support Pokémon Sets. Wave 1 of the Battle Pack contains Battle Pokémon Aegislash and a new Support Pokémon Set featuring Mega Rayquaza and Mimikyu. Aegislash can change between two formes, and players can wield them both. Wave 2 includes the new Battle Pokémon Blastoise and a new Support Pokémon Set featuring Mew and Celebi. Wave 1 will be available Jan. 31, and Wave 2 is scheduled for March 23. Both Waves of DLC are only available with purchase of the Battle Pack; they are not sold individually. Content will be available as it is released.
YouTube Clip - Nintendo Direct Mini 1.11.2018
YouTube Clip - POKKÉN TOURNAMENT DX [Nintendo Direct mini 2018.1.11]