>>39191030>>39190973Guess it depends on the Country, as other anons point out it was changed in the EU. It wasn't implemented until later:
Game machines replace the slot machines in the Korean versions of Pokémon Diamond, Pearl, and Platinum, due to the illegality of gambling in South Korea and the classifications standards of the Game Rating Board, removing all references to slot machine gameplay. Since the slot machines are integral to obtaining TM64 in all other versions, Korean versions of these games will occasionally reward the player with the TM while talking to the Game Corner's receptionist.
These changes were copied to European versions of Pokémon Platinum, including the UK release, as a result of changes in the classification standards at PEGI[1][2].