Japan Anniversary Association, a group that certifies days of the year as unofficial holidays to celebrate something, has certified November 21 as Eevee Day in Japan.

To celebrate this special milestone, The Pokemon Company has kicked off a Project Eevee Twitter campaign that will end on November 30, 2018.

The moment the “Eevee Day” hashtag hits 121 tweets, 70 Eevee King files will be given away. At 1121 tweets, a set of three Pokemon Let’s GO Eevee plushies will be distributed to 21 winners. Finally, at 11,210 tweets, 9 winners will walk away with a Pokemon Let’s GO Eevee Poke Ball Plus set and the autograph of Eevee’s voice actress.

More announcements, such as the Eevee Tamagotchi, are expected to be made this week.