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magmarizer and electrizer don't come until diamond and pearl
There is a guy near Undella Bay who gives you free things. He might give you a magmarizer.
Magmar in the Safari Zone then trade it while holding the magmarizer.
If you attach it to Magmar and trade it while it is holding the Magmarizer, it will evolve into Magmortar.
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.