Piranha Plant is the first DLC character coming to Super Smash Bros. Ultimate and the chance to claim a free one will be over soon. The good news is that it is really easy to make sure you do end up with the fighter, when it releases sometime in February. All it requires is that you purchase the game, either retail or digital, by January 31st. If you purchase digitally, you will receive a message to the email associated with your MyNintendo Account that contains a unique download code for Piranha Plant. That code can be used anytime and will set your account up for automatic download on the release day.
If you purchase at a physical copy, there are some extra steps you will need to take care of. From Nintendo’s Website:
“If you buy the retail version, then you’ll need to register your game card with My Nintendo before 11:59 p.m. PT on Jan. 31, 2019. Here are the steps:
1) First, create a My Nintendo account at my.nintendo.com if you haven’t already done so.
2) Insert the game card into your Nintendo Switch console and highlight the game icon on the HOME menu.
3) Press the + or – button to access the software Options menu.
4) Highlight “My Nintendo Rewards Program,” then select “Earn Points (Game Card version only)” to finish the process.
Once registered, you’ll receive the download code** via the email associated with your Nintendo Account within 10 days. Enter that code on Nintendo eShop.”
If you do not register before the cutoff, you will have to purchase Piranha Plant as DLC at a later time. So make sure you are setup!