free card sleeves Vault X: Exact Fit and TCG players BCW Card Sleeves (Thick)

A 5% leeway is given to the front centering minimum standards for cards which grade PSA 7 or better

TAHK0 speculated on why the error may have happened, writing, Poke Balls went through a lot of early variations, with everything from the button placement changing, to how it opens differing, to even being depicted with the white on top. It could be that an early Pok Ball design actually did open like it does on the card back, but when the design was eventually changed to the opposite way, they forgot to update it on the card back before going to print, and it remains that way to this day

Centering must be 70/30 to 75/25 or better on the front and 90/10 or better on the back

The only real downside is that the opponent can use it too so it's a gamble when being matched up against other fusion decks