Thanks for the reply, I decided to go with ralts, and keep slacking. Would it be dumb to replace aggron with dusclops, though? Because I don't love Aron that much...
Not really. Aggron is a cool Pokemon, but it has two 2x weaknesses in Fighting and Ground, and it can't learn any Rock-type moves by leveling. The only real reason to use it is Earthquake, but then again, you could give that to Blaziken, Slaking, or Dusclops.