If you attach it to Magmar and trade it while it is holding the Magmarizer, it will evolve into Magmortar.
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magmarizer and electrizer don't come until diamond and pearl
Trade a magmar with the magmarizer
You can't. On Diamond, Pearl and Platinum there is a 5% chance that Magby will hold the Magmarizer.
The Magmarizer only appears on Route 214 on Pokemon Platinum. In Pokemon Platinum the Magmarizer can be found north of Ruinic Maniac Bryan on Route 214.
Magmar