In Pokemon Diamond and Pearl you need the National Pokedex to get Magnemite. In Pokemon Platinum you don't need the National Pokedex to get Magnemite.
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You can make Magnemite appear in Fuego Ironworks as a Swarm after you obtain the National Pokedex from seeing every Pokemon in the Sinnoh Pokedex. To know if Magnemite has appeared talk to your rival's sister in Sandgem Town. If Magnemite hasn't appeared try again the next day as Pokemon Swarms change every day.
You need to get the national pokedex to get national pokedex you need to get all the Pokemon and you need to talk to daun's sister
You need a national pokedex. You get a national pokedex by filling your Sinnoh pokedex, and then going to Professer Rowans lab. Professer Oak will upgrade your pokedex so you will get the national pokedex. The guys will get out of your way then.
No
well, aparently, i need a finneon to get the national pokedex, but, i need to fish with a super rod to get it, and i need the national pokedex to complete the sinnoh pokedex, so, there, I PROVED THAT WRONG you can only get it after you have defeated the elite four and obtained the national pokedex. after this you can get it frmo a fisherman in the fight area