Sorry, but you can't. You can trade from LeafGreen to Pearl, but not back.
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On Pokemon Pearl's title screen, if the Pokemon LeafGreen game is in the GBA slot, click on "Transfer From LeafGreen" and you can choose six Pokemon from LeafGreen to transfer to Pearl, but be careful-you can't trade them back.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
No. But you can trade from FireRed, LeafGreen, Sapphire, Ruby or Emerald to Diamond, Pearl or Platinum
no, you can't trade Pokemon from gold to leafgreen. But you can trade them from Pokemon XD from gamecube.
You cannot catch Raikou in Pokemon Diamond and Pearl. To get Raikou in Pokemon Diamond and Pearl, you must trade for one from Pokemon HeartGold and SoulSilver where it can be caught or transferring from Pokemon FireRed and LeafGreen.