Shining Raikou said:If you think about it, they do belong there. The card style did not change from the Diamond & Pearl sets to the Platinum sets. (Where the EX sets had a different card styling than the E-cards, Diamond & Pearl, etc.) HeartGold & SoulSilver will probably get it's own category since the card styling has changed.
xxashxx said:Those are still Diamond and Pearl cards and I agree with Shining Rsikou also because Platinum is part of the D/P/PL series. Still in the same generation so they are in the right place on the Card sets lists.