When I was playing gen I and II I thought I'd become a dragon-type trainer in the post-game. However, now that I do have the patience to play until post-game in Emerald, I ended up as a steel-type trainer before I know it. How I learned it? Well, I met a dragon tame with charizard and it burned my pokemons to faint. Is there a steel-type that's more or less resistant to fire? Like, steel/fire or steel/water? So far I have steel/flying (skarmory), steel/ground (aggron) and steel/psychic (metagross) for Battle Frontier lv50 challenges. Steel/eletric magneton is still in-training.
I think Ruby contracted steel-type love via Steven Stone.
Oh, and I can't trade pokemons since I'm using an emulator (did not borrow lunatique's NDS because I wouldn't stop playing if I had it; here I can only play while at home).