Meh, I don't get why so many people think this Steelix will belong to someone, or if someone will get it. They ain't gonna give anyone in the group a pokémon like Steelix, considering it is one of the older generation pokes...
I think that the title of the episode kinda implies that its a wild one anyways. I'm guessing its one of those 'bully' pokémon (remember that giant Onix?) that has gone bad for some reason or another, and is causing problems in the valley, so Satoshi-tachi have to dispose of it.
I agree with Pewter City Geodude. I'm surprised there aren't any new steel types being introduced....or are there?
I like the idea of Flannery being around for a while too. Nor my favourite character, but its always nice to see a new face in the group for a while. If she does tag along, I'm guessing it would be for training. She is only a beginer at gym leading after all.