[quote=@Lucius Cypher]
[@Lugia]

How about electricity? That way if you go up against any flying or water types you have a move for them. Ice is also a good one if you need to deal with ground, dragons, and for some reason grass types though you cover that with fire anyways. Straight up dragon element is a bit cliche for charmander lines but it's decent too, so long as you're not up against any faeries. Ice is pretty much the only other thing dragon would be weak against and I don't imagine a Charmander will have any issue with ice pokemon. 
[/quote]

Well, I know which ones would be GOOD, the main answers being ice, ground, and grass (though grass is often replaced with Solar Beam)... I'm just not sure which one I should have Trevor have, lol.