Like Pokémon Diamond & Pearl, Pokémon Platinum is set up so that if you have one of the 5 GBA games inserted into your DS, changes appear to the Wild Pokémon. Most of the time in some areas it's just like say a Level 2 Staravia in Lake Verity. However, there are a fair few Pokémon that are exclusive to this method. So for you to catch them all, you will need the respective game plugged into the 2nd slot of the DS while you play. Below is the list;

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1. The GBA slot (Game Boy Advance) allows the DS to play some GBA videos and single player games that are compatible with both the DS and GBA. There are also a few DS-only games that require the use of the GBA slot for extra game accessories (a music game might have the ability to have a keyboard in the slot).
2. Either remove the Nintendo DS Game Card and restart, or change the system setting to Manual Mode. Complete these steps. Remove the Game Pak Slot Cover from the Game Pak Slot (SLOT-2). Keep the Game Pak Slot Cover so that you can put it back into SLOT-2 should you remove your Game Boy Advance Game Pak.
3. While inserting a cartridge into a DS Lite's GBA Slot. You may notice that it sticks out slightly. Do not try to push it in completely, as it may damage your console.
4. NM64 says: Jan 31st 2020: I'm totally late on this, and this is about an older blogpost, but I just wanted to point out that the DS officially supported expanding the RAM via the GBA slot as this was used by the Opera Browser - it not only came with a normal DS game card, but a 4MB ram expansion in the form of a GBA cart.

Hi everyone, First off, I would like to thank you for making a great DS emulator. Okay, I know it's not possible to transfer pokemon from Pokemon GBA games (Emerald, Ruby, Sapphire, FireRed and LeafGreen) to Pokemon D/P/P games thru Pal Park because DeSmuMe only reads GBA roms, not save files (GBA Slot).

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