So I'm making a steel monotype team for the postgame/Monotype meta, and I have the following Pokemon on my team so far on my core:

Skarmory @ Rocky Helmet
Ability: Sturdy
EVs: 248 HP / 252 Def / 8 Spe
Impish Nature
>Stealth Rock
>Roost
>Whirlwind
>Brave Bird

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 248 HP / 52 Def / 208 SpD
Careful Nature
>Power Whip
>Leech Seed
>Protect
>Spikes

Heatran
Ability: Flash Fire
Timid Nature

My questions are: What pokemon should I finish the team with, and what moveset should I give my Heatran? Critiques appreciated and all that shit.

Pic slightly related