That's odd, Steelix should still be learning moves unless you somehow messed up when editing his evolution so that it doesn't load his moves anymore. These are the moves he should be learning.
http://bulbapedia.bulbagarden.net/wi...By_leveling_up
All I can say is, if you are hacking my hack, I can't really help you because all I know is what I've done, I can't say what will change when other people start poking around with it. That would be like asking Gamefreak for help when you get stuck in Brown Version.