if i was an emerald pokemon, i'd b... Blaziken! cuz i have a temper problem sometimes, and i like to play w/ fire (i kno, bad idea), and i can seriously FIGHT!!! meaning like im strong, can fight, have good fighting endurance as long as i dont have to chase the opposition down, wear a hard watch on my punching arm (ive hit my self w/ it on purpose to see how hard it was and trust me, it HURTS!!!!), and am not afraid to kick below the belt.
but if i could b a diamond pokemon, i'd b gallade cuz i can fight(as described), and im seriously smart, so the psychic type fits. and im terrified of bugs but will squishify them, like the psychic type is weak to bugs but the fighting type fights the weakness.