LogFAQs > #960413144

Steelix is really cool, but you have to trade an Onix with a Metal Coat for it to evolve. So you can't just toss it up on the GTS and get what you want. Not a problem if you have some one to play with.

As far as other things...
-Natures are pretty impactful, but Onix tend to be rare and difficult to catch, so cycling through them looking for a beneficial nature would be a terrible pain (IIRC, they also take longer than normal to hatch from an egg. Onix is a pain in the ass, is what I'm saying, and it's really terrible until you evolve it. Steelix is pretty decent and, IMO, much cooler than Golem). It would be much easier with Geodude, but there's no need to worry too much about it unless you want to battle competitively at which point you won't see Golem or Steelix except in really low tiers.

As for how I play, I really like to experiment with new mons. I have a fondness for Grass types, personally, but I try to get a somewhat balanced type load-out. Try to avoid building a team with too many common weaknesses(particularly to powerful offensive types like Ground, Ice, Fire, etc.) unless you're patient.

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