Purification
If you want to purify more Pokemon I suggest you go to MT. Battle and start from area one. This way you go through a lot of battles causing the pokemon's heart to open more. When the heart ready to open finish the area and go to the PC. Place the Pokemon in the purification chamber and then you can either take and battle with more shadow Pokemon or go to the lab and purify the pokemon. Note: If you continue to battle I suggest you fill all nine sets. Note2: If I'm correct the strongest Pokemon you should have is purified so I suggest you keep that with you.
If you need more help, we've got more Pokemon XD: Gale of Darkness cheats and also check out all of the answers for this game
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