Capybara Gaming
Just as I thought, it's from a TCG set
Actually, I think I'm gonna try and look at which Pokemon were pushed on TCG sets. I just realised everyone and their mother have been sleeping on these
Local PTCG player here.
Sun/Moon Base Set (Feb 2017): Solgaleo/Lunala, and the starters to a lesser extent
Guardians Rising (May 2017): Tapu Koko and Midnight Lycanroc
Burning Shadows ( August 2017): Ho-Oh and Marshadow
Shining Legends (October 2017): Mewtwo and Shiny Pokemon
Crimson Invasion (November 2017): Silvally and the UBs
Ultra Prism: (Febuary 2018) Sinnoh and the new Necrozma forms
Forbidden Light (May 2018) Ultra Necrozma and Kalos
Celestial Storm (August 2018) Hoenn and Stakataka
Dragon Storm (October 2018) Unova.
As for the Four frontrunners
Decidueye and Incineroar: Both got a GX in the Base Set.
Lycanroc: Midnight got a GX in GR, Midday got a Box set. No Dusk one yet
Mimikyu: Got a weird Japan Exclusive Team Rocket GX.