Who is the only Pokemon who...?

[Cleobel]

Hello everybody! Because every Pokemon is unique (and also for the PXR User Challenges), I suggest you this Pokemon-guessing game.
I will post a list of requirements for a Pokemon and the next poster will have to find the only Pokemon who meets all the requirements. If their guess is correct, it will be their turn to post a list of requirements, and so on. Please try to make sure that only one Pokemon meets all the requirements of your list (but mistakes can happen, of course). I hope I explained the rules clearly, and please feel free to ask if you have any question about them.
Here is the first list of requirements : who is the only Pokemon who...?

-Is a Steel-type Pokemon
-Isn't genderless
-Can't be both genders

[Voltaire Magneton]

-Is a Steel-type Pokemon
-Isn't genderless
-Can't be both genders

Is it Trash-Cloak Wormadam? :o

[Cleobel]

Is it Trash-Cloak Wormadam? :o

Yes, it is! :)

[Voltaire Magneton]

Well then, the next Pokemon is:

1. Bug-type
2. Used by a Frontier Brain in Emerald
3. Has a special mechanic

this is kinda easy, i had a hard time thinking of a question

[Noblejanobii]

Is it Shedninja?

[Voltaire Magneton]

Is it Shedinja?

Yep! :D

[Noblejanobii]

Well the next Pokémon is:

1. Based on the vulpus genus
2. Has multiple forms but cannot switch between them
3. Its evolutionary places a large role in one of the side games

[Bulbasaur]

Well the next Pokémon is:

1. Based on the vulpus genus
2. Has multiple forms but cannot switch between them
3. Its evolutionary places a large role in one of the side games
Gonna make a fairly random guess and say Vulpix?

[Noblejanobii]

Gonna make a fairly random guess and say Vulpix?

Yep!