?

Say there could ever be a Pokèmon that can have more than two types.
Could there by any type that would be super effective against a Pokèmon typed as follows: Steel, Flying, Fighting, Fire.

Yea there is a pokemon called Gliscor. Gliscor is a Flying/Ground type pokemon which can learn Ground, Flying, and Rock type moves

Ground has no effect on flying though, and isn't flying not very effective against Steel?

He can learn rock type moves, and ground is super effective against steel.

btw what version are you playing if you are happening to be playing one?

Black 2

Btw. Pretty sure fighting is super effective against rock

http://www.serebii.net/pokedex-bw/207.shtml

gliscor is good since he is quite bulky, defense wise, and can deal damage. The only downside of him is he is 4x weak to ice.

He's a Flying/Ground type

I gave you his pre-evolution.

You said he can learn rock moves though and I actually got a Gliscor one or two days ago

omg you noobs

I'm not a noob when it comes to Pokèmon, I simply asked a question about an imaginary Pokèmon that had 4 types

Obviously you are a major noob if you don't even know how the types work.