While the regular Piranha Plant is making its debut for Super Smash Bros. Ultimate, the large mutated Piranha Plant, Petey Piranha, will join Mario Tennis Aces alongside Shy Guy as new playable characters starting December 1.
Here are new introduction trailers for Petey Piranha and Shy Guy showing their basic, technical, and special shots:
You can unlock Petey PIranha by joining an online tournament (singles) from December 1, 2018 to January 1, 2019.
You can get Shy Guy by playing in an online tournament (doubles) from December 1, 2018 to January 1, 2019.
Both characters will be available without the unlock requirements starting January 1, 2019.
Mario Tennis Aces is available for Nintendo Switch.