The variant picker
On every card detail page a variant strip lets you cycle through every printed variant of that Pokemon at that number. The artwork swaps, the price matrix swaps, and the rarity label updates — so you can see what each version looks like and what each one trades for without leaving the screen.
When you scan a card, the scanner identifies the specific variant directly. A Master Ball Mew is a different match than a Pokeball Mew, and both are different from the regular reprint.