I need to make a team for a monotype tournament that me and my friends are having, so I chose the best type: steel
Here's what I've got so far

Aggron
252 atk/252 def/4 spdef
Aggronite
Rock head
-Iron tail/ Iron Head
-head smash
-earthquake
-aqua tail

Lucario
252 spatk/4 def/252 speed
Lucarionite
Justified
-dark pulse
-aura sphere
-flash cannon
-nasty plot

Bisharp
252 atk/252 def/ 4 spdef
Air balloon
Defiant
-iron head
-sucker punch
-swords dance
-psycho cut

Metagross
252 atk/252 def/4 spdef
?
Clear body
-meteor mash
-Zen headbutt
-Bullet Punch
-hammer arm

Aegislash
252 atk/ 252 def/4 spdef
Air Balloon
Forme change
-kings shield
-shadow sneak
-iron head
-sacred sword

Klefki or Ferrothorn
4 atk/252 def/252 spdef or 252 hp/4 atk/252 def
rocky helmet
Prankster or Iron barbs
-play rough or power whip
-foul play or spikes
-thunder wave or leech seed
-spikes/toxic or stealth rock

I might trade out someone for Scizor or Heatran