pokemon sv8.5 scarlet and violet prismatic evolutions booster pack Pokémon featuring Eevee ex Pokémon Scarlet SV8.5 Prismatic Evolutions

Something along the line of a scannable code on cards to verify authenticity would get the job done, but implementing the program would be costly, and it wouldn't help with all the cards that are currently in print (barring some sort of mass-exchange program, which would be even more prohibitively expensive)

The packs look identical to every sealed copy Ive seen available in the past five years _()_/ The stapling of the promos to the piece of paper they were mailed with also lines up - Ive seen several of these packs with staple holes, and unfortunately, have seen a few raw copies of cards with a pin hole or two

Just open the rom up in any hex editor and you can search for whatever text you want to edit

However, since the choice lies with your opponents, you'll need a backup plan if they decline and turn their now-buffed creatures against you