Medicham: It has a fantastic Movepool and great Couverage with High Jump Kick (Lv up), Thunder/Ice/Fire Punch and Zen Headbutt (Move Tutor). Especially HJK does insane damage, a Move with 130 Base Power + STAB isn't a Joke. S Rank
Magneton: In my Opinion, it is better than Amphraros. Steel is actually a great Type. Unfortunately Flash Cannon and Discharge are his only good Moves, so the Couverage isn't that good, exept you get somehow a good Hidden Power Type. A or B Rank.
Honchkrow: Really good Pokemon with Sucker Punch + Moxie and with Farfetch'd, it can learn Brave Bird (And Roost if you want). S or A Rank
Gardevoir: Undoubtedly a fantastic Pokemon, even if its walled by every Steel Pokemon. It resists Shadow Moves and has access to Moonblast, Psychic, Calm Mind, Draining Kiss if you want and Trace. But unfortunately, It isnt available yet without abusing the Bug. S Rank