japanese 20th anniversary booster box 2016 Pokemon CP6 Japanese Pack (LIVE) CP6 20th Anniversary Booster Box

This card was only available at the Pokemon Centers in Japan, in March, 2018, for a very limited time and in very limited quantity, during a special SM#6 Forbidden Light booster box promotion

Here's a sample list from DiamondDudeTCG, who got 1st Place at CC2

On top of that, it also returns to your library if ever put into the graveyard which makes it especially fun to play in any sort of deck with tutor effects

Folks have stepped into this gap with their creativity, making and selling their own versions of these tokens, and I know of at least one person who uses Bananarama Runts

This means Nightmare Soldiers Digimon like Myotismon and Piedmon, as well as Deep Savers Digimon like Plesiomon and MetalSeadramon