first you need leaf green version, insert it into your ds, then go to stark mountain keep looking until you find magby once you find and catch magby train him to level 30 then you will have magmar.
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Trade a magmar with the magmarizer
yes the is not one
you must trade or migrate a magmar/magby from another DS Pokemon game or Pokemon ruby/sapp etc trade a magmar while it is holding a magmarizer for it to evolve into a magmortar
If you attach it to Magmar and trade it while it is holding the Magmarizer, it will evolve into Magmortar.
You can only "learn" Fire Punch in Diamond via breeding a Pokemon with another who already knows Fire Punch (Magmar for example)