You need the clean USA Revision 1 ROM (Scene ID: 4997).
If you are looking for an enhanced way to experience Sinnoh, these specific hacks require the 4997 base: pokemon platinum 4997 rom extra quality
Trainer teams are revamped to be tougher but fair, giving Gym Leaders competitive move sets. You need the clean USA Revision 1 ROM (Scene ID: 4997)
Always scan any downloaded ROM with a reputable antivirus. Avoid executable files (.exe) pretending to be ROMs; a legitimate ROM is a .nds file. pokemon platinum 4997 rom extra quality
To use these "Extra Quality" features, you generally need to apply an .xdelta patch to a clean ROM using a tool like Xdelta Patcher . JimB16/PokePlat: Disassembly of Pokemon Platinum - GitHub
The of rare/legendary Pokémon like Arceus or Darkrai.