Unlock Elekid and Magby
The only way to unlock these characters is by having either Pokemon FireRed or LeafGreen version in your GBA slot.
Unlock Elekid:
With FireRed in your GBA slot search in the Power Plant.
Unlock Magby:
With LeafGreen in your GBA slot search in Hard Mountain.
We have more cheats and tips for this game here, Pokemon Pearl cheats
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