#55 - Space for Mistakes

The back of the Australian cover of Pokémon Diamond states that the player will "search for the Pokémon that rules space". This is a very basic mistake because it's Palkia who rules space, not Dialga, and Palkia belongs to Pokémon Pearl.

SOURCE: https://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon_Diamond_and_Pearl_Versions#Trivia