Things You'll Need
Instructions
Obtain the HM Surf move in Celestic Town after helping Cynthia's Grandmother.
Earn either the Fen Badge or Relic Badge by defeating the gym trainers in Pastoria City or Hearthome City respectively.
Identify all 150 Pokemon of the Sinnoh Region on your Sinnoh Pokedex. Do this by encountering them in battle, or catching them.
Talk to Professor Rowan of Sandgem town. Professor Oak will arrive and offer to upgrade your Pokedex to the National Pokedex, allowing you to identify, and obtain Pokemon non-native to the "Pokemon Pearl" game.
Go to the Pal Park at the east end of route 221 in Sinnoh. It will now be open.
Insert your generation III Pokemon game, either "Pokemon Ruby," "Pokemon Sapphire" or "Pokemon Emerald" into your Nintendo DS's Gameboy Advance cartridge slot.
Trade Torchic from your profile in one of these games to your profile on "Pokemon Pearl."