Here's what I understand from your question:
* "Metal coat": This is a held item that allows a Pokemon to evolve into a different form. Specifically, it allows Scyther to evolve into Scizor when traded.
* "Magemite": This is likely a typo. There is no Pokemon or item named "Magemite" in FireRed.
* "One metal coat": This suggests there's a single, specific metal coat that you are looking for.
It seems like you're looking for where to find a Metal Coat in Pokemon FireRed. However, the information about it being "not on a Magemite" is unclear.
Here's how you can find a Metal Coat in FireRed:
1. Trade with another player: This is the most common way to get a Metal Coat. Many players are willing to trade for it.
2. Find it in the wild: There is a very rare chance that a Metal Coat can be found in the wild held by certain Pokemon. This is a very difficult method, but it is possible.
3. Use a Game Shark or Action Replay: These devices allow you to cheat and add items to your game, including the Metal Coat. However, using these devices can affect your gameplay and enjoyment, so it's recommended to avoid them.
To find the Metal Coat, it's best to trade with other players or search for it in the wild if you're looking for a more challenging approach.