Sorry I haven't been able to contribute much lately, I've been busy. (Two more weeks until exams are over though, not long to go!)

[3/3] Audino for bottom

[2/3] Delcatty for bottom

[3/3] Scolipede for lower-mid

I'd like to point out that Steelix does really well against the notable trainers: he crushes Skyla, does fine against Drayden, does decently against Shauntal with Crunch (and possible Caitlin as well, though his SpD isn't that high...) and does well against Iris. Plus you can evolve it pretty early by using Thief on some Magnemite, I guess. That's enough for at least mid imo. [2/3]