You go out and buy an Action Replay or you can make an Electabuzz hold Electirizer and trade the Electabuzz.
Wild Electabuzz and Elekid can sometimes be found holding an Electirizer in Pokemon Diamond, Pearl and Platinum. You will need to use the move Trick (or a similar item-stealing move) or catch these Pokemon to get an Electirizer.
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Elekids normally hold it
find an elekid and you have a 50% chance it will be holding an electirizer.
you find it bihind the bloody focking valley windworks
Have it hold an Electirizer and trade it.
Electabuzz will evolve when you have Electabuzz hold the Electirizer and then trade it.