https://www.gamespot.com/articles/first-nintendo-switch-pokken-tournament-dx-update-/1100-6454059/

Nintendo is rolling out an update for the Switch Pokemon fighting game, Pokken Tournament DX. This is the first update since the title launched last month, and it adds some notable new features.

Along with some as-yet unspecified gameplay tweaks, the Pokken Tournament DX update introduces Online Team Battles to the fighting game. As in the offline version of this mode, you select three Pokemon to take into battle; when one is knocked out, you'll take control of the next until all three of a player's Pokemon have been defeated.