Nintendo has announced that there will be double EXP and SP in a three-day event for Super Smash Bros. Ultimate on Nintendo Switch, this weekend.
On 11/01, the three-day event "Double EXP and SP!" will take place on the Spirit Board in Super #SmashBrosUltimate! Any EXP and SP earned through Spirit Board battles during this event period will be doubled! It's your chance to really power up your spirits! pic.twitter.com/3tcBfwdh12
— Nintendo of Europe (@NintendoEurope) January 9, 2019
As the tweet above says, Spirit Board EXP and SP earned during the event that starts on January 11th, will be doubled.