Things You'll Need
Instructions
Defeat the Elite Four and speak to Professor Rowan in Sandgem Town. He will give you the National Pokedex.
Insert a Game Boy Advance "Pokemon" version with the captured Rayquaza into the GBA cartridge slot of your Nintendo DS.
Press "Start" to open the in-game menu and save your game. Restart your Nintendo DS game system and press "A" to reload "Pokemon Pearl."
Select "Migrate from (GBA game)" on the main menu and choose "Yes" to confirm.
Use the directional keypad and press "A" to select Rayquaza and five other Pokemon that you would like to migrate into your "Pokemon Pearl" game. The game will then save and restart.
Press "A" at the Nintendo DS main menu to load your "Pokemon Pearl" game.
Travel to Route 221 and enter the Pal Park. You will receive Park Balls, which have a 100 percent chance of catching any Pokemon.
Walk through tall grass in the various areas of the park to encounter the migrated Pokemon from the GBA game. When you encounter a Pokemon, you cannot run from battle and must throw a Park Ball to capture it.
Continue exploring and walking through tall grass until you encounter Rayquaza. Throw a Park Ball to capture Rayquaza.