Okay, I just thought of a steel type and part steel team only and I did some research on the page. The team is only made of four since the rules say that no more than four are allowed. This is not related to Smogon, Showdown or any other Pokemon battles sites etc. This is a thing I'm doing with my siblings and relatives.
I've chosen Aegislash, Metagross and Bisharp.
The last piece of the puzzle might be Ferrothorn, Bastiodion or Empoleon. I hope that I get a good answer. If it isn't to much, but a move set would fit in nice as well. A moveset would be welcomed as well.
EDIT: Changes in the team are welcomed as well.