The magmarizer you can get on route 214 and is sometimes held by wild Magmar which you can get at the Fuego Ironworks and then the electerizer you could get in Valley Windworks and is sometime held by wild Electabuzz who you could get on route 222.
If you want to get the items from a wild Pokemon I would suggest teach TM thief to one of your Pokemon who could learn it and put them first in your party then go out to the places those two wild Pokemon are and when you encounter one keep using thief on them and you may eventually get the items from them. This way you don't have to catch a million of the same Pokemon.
Make sure you take the item from your Pokemon that used thief so it can take another item from the wild Pokemon without fail.
Good Luck to you.
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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.
You can't. On Diamond, Pearl and Platinum there is a 5% chance that Magby will hold the Magmarizer.
To get magmar to evolve, you have to give it a magmarizer and trade it to someone else.
The Magmarizer can be found within Route 214.
on route 214 by the ruin maniac