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Quilava is much more useful if you have Flame Wheel, which should OHKO the Magnemites and significantly injure Steelix, and if Quilava has Dig or a similar Ground move - such a move easily sweeps her entire team, from my past experiences with Quilava on SS and the original Silver.
Well Flame Wheel's base power of 60 doesn't do much to Steelix's base defence of 200, especially considering its level (even after STAB and super effective). And Dig wouldn't even get STAB. It would be easier to just buy a Fire Blast TM (TM38) from Goldenrod City MegaMart for 5500 pokedollars, as that is more powerful than Flame Wheel and, more importantly hits Steelix's weak Special Defence rather than its godly defence.
Taking evolution of Sunkern into mind. Aside from the Bug-Catching Contest, are there any places you can find a Sun Stone?