Apparently Brilliant Diamond and Shining Pearl share the same rom and you can unlock the other version by changing an offset : r/PokeLeaks

Bi-Weekly Questions Thread : r/PokemonROMhacks

Pokémon Brilliant Diamond & Shining Pearl are the exact same rom

Pokemon Diamond And Pearl Remakes Reportedly Leaked by Retailers

Pokémon Brilliant Diamond, Shining Pearl Leaks Tear Fans Apart

ALL Version Exclusive Pokemon For Brilliant Diamond Shining Pearl

Can you turn off Exp Share in Pokemon Brilliant Diamond & Shining

Apparently Brilliant Diamond and Shining Pearl share the same rom

Pokémon Diamond, Pearl Remakes Revealed, Fans Split on Art

Well it's that time of year again, Pokémon Brilliant Diamond and

Can you trade Pokemon from other games into Brilliant Diamond and

Pokemon Brilliant Diamond, Shining Pearl, and Legends Arceus

Datamine: Pokemon Brilliant Diamond/Shining Pearl Made With Unity