Super Smash Bros. Ultimate players have reported Piranha Plant is corrupting save files. Might want to wait on a fix before using the character, to be safe.
You might want to hold off using Piranha Plant in Super Smash Bros. Ultimate All-Star Mode for the time being.
Nintendo deployed the latest update for Super Smash Bros. Ultimate overnight, which included DLC character Piranha Plant. Since applying the update, many players have reported using the character causes their save files to become corrupted when used in All-Star Mode.
