The game version is different: diamonds and pearls need to be inserted into genuine GBA cards to meet elves, while platinum can meet without that. Compared with diamonds and pearls, platinum has four more battle facilities at the battle front (while diamonds and pearls only have 1 battle tower). In addition, platinum is an information version of pearl diamonds, which combines the elves that pearl diamonds can capture.
Pets are different: Ebou can only be caught after customs clearance in diamonds, but he can catch one before customs clearance in platinum; In the haunted house of EMI Forest, there is a TV survey that can catch electric ghosts. Platinum can be caught at the beginning, but precious diamonds can't be caught. Electric Beast and Duck-billed Fire Dragon are only available in platinum, not precious diamonds.