Question

I caught a steelix that knows Curse, but as far as I know Steelix can't learn it. My best guess is that it is an egg move.

Answer 1

It learns it at level 38 in Platinum, HG, and SS. Since you say you caught it, I assume this is Platinum.

Comments

Ok thanks. Is there an error on this page then?

http://pokemondb.net/pokedex/steelix

Because that's not on there, and I just tried to teach it double-edge via heartscale and it wasn't available (it is level 48).

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The Pokedex pages for the database have not yet been fully updated with Platinum, HG, and SS moves. Also, Steelix in those games learns Double-Edge at level 49.

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Ok thanks again.  That would make sense, and also explain how my Flareon learned lava plume.

And it's HG, by the way.