In the Battle Frontier, you can buy scratchcards for 1bp each. You can do up to three Scratch-off cards at a time. In order to win a prize, you have to match three of the same icons, or a ditto. If you manage to match three of the same Pokemon (or one or two ditto), you will get whatever price that is associated with that particular Pokemon.
However, if you fail to match the symbols, you get nothing.
Did you ever purchase these scratch-off cards in Platinum and HG/SS?