Things You'll Need
Instructions
Importing Pokemon into Pearl
Turn off the Nintendo DS. Place the Pokemon Pearl DS cartridge into the cartridge slot.
Place the GBA Pokemon cartridge (Pokemon Ruby, Sapphire or Emerald) in the GBA cartridge slot on the face of the DS system.
Turn the DS system on and select the "Pokemon Diamond" option to begin the game.
Select the option "Migrate From GBA" by using the directional pad to highlight the choice, then pressing "Yes" to confirm.
Select the Pokemon you are migrating with the touchscreen: Regirock, Registeel and Regice. Select "yes" to confirm.
Capturing The Imported Pokemon
Power the DS system off. Remove the GBA cartridge from the DS, leaving the Pokemon Pearl cartridge inserted.
Battle the Pokemon League. Win that battle to get the National Pokedex, which you need to access Pal Park. Proceed to Pal Park, slightly outside of Sandgem town.
Walk into Pal Park. Roam around the park. The encounter with the Regis is not a timed one, so you may be engaged in battle with them at any time.
Battle the Regi Pokemon. Weaken the Pokemon with attacks until their health points are low, taking care not to defeat them completely since live capture is the objective. Throw poke balls to capture the Pokemon.