how to use dual slot in pokemon platinum

[computer]

how do you use dual in pokemon platinum

[Zidarose]

To access the Dual-Slot Pokemon, you must have cleared the game, getting the National Pokedex. After that with a DS or DS Lite (the DSi is not compatible with this feature), put one the five GBA Pokemon games into your GBA port, on the bottom of your DS, and boot up Pokemon Platinum. Simply check the guide linked below to see what will appear where. These generally have a lower appearance rate, but they will show.

All the Pokemon you can catch using the Dual-Slot can be found here:
Pokemon Platinum Dual-Slot Pokemon