You get the Metal Coat in different places for each different version. If I remember right, in Pokemon platinum and pearl and diamond you get it somewhere on Iron Island...... Oh yea! After you beat the elite four, or just the Steel Gym, you can find the Steel gym leader on Iron Island in a small house and he gives you the Metal Coat. Also, for Pokemon Emerald, I think you get it from Blue, on the island where the Fire Gym used to be. For Platinum, you might also be able to get it as a reward for BP at the Battle Frontier. I'm not sure about that though.
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If you catch a Pokemon in the wild are this the Pokemon who can bear a Metal Coat. It has a rarity of 5%. Magnemite, Magneton, Steelix, Beldum, Metang, Metagross, Bronzor, Bronzong and Magnezone
All I really know is that you can find one in iron island after you help riley. There should be two exits. Take the one that leads upwards and there will be a pokeball in the center of the room. Take it then you should get a metal coat!
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IN the Pokemon mansion you can find, ratatta, kofing, Picachu, grimer, and if your lucky, you will be able to find, Muck
You find a metal coat near the memorable pillar on five island.
go to iron island
at a Pokemon video game store like game stop.
1. find and catch a Scyther 2. try to find the item: Metal Coat 3. trade with someone while Scyther is holding on metal coat 4. the Pokemon will evolve into Scizor Source: http://bulbapedia.bulbagarden.net/wiki/Main_Page
On five island surf to the right and find the memorial of a dead onix nearby is a metal coat.
You find one on five island, near the memorial pillar
Catch a Scyther. Then get a Metal Coat. Attach that to Scyther and then trade.
you go to the island with the stone pillar. It has a person mourning a deceased Onix. If you give him a lemonade, he will give you metal coat.
It's fake. If you find it, there will be a bunch of hacked Pokèmon.
You can find it at most stores where video games are sold.
You can find the metal coat by going to route 32 (route before the ruins.) and going to the top most part of it. You will find a poke ball. go near it and press space to get a metal coat. Metal coat will also be unlocked in the item store!
My good sir, mega balls are nonexistent in the pokemon video game series.