Hoenn contains one of my most favourite Pokemon of all time, Flygon. Design wise it looks incredible with the red eye-glasses-thingy, wings, colour design and general body shape and fits the desert dragon idea very well. It's pretty powerful with Earthquake and Dragon Claw (at least in later generations, although I'm sure Flygon was decent back in R/S/E) and could use Fly which was useful. Trapinch was a nightmare to train and Vibrava wasn't much better, but once I had Flygon things went much smoother. Definitely one of my favourite Pokemon of Hoenn. Special mentions go to Sceptile, Swampert, Manectric, Camerupt, Sharpedo, Absol, Glalie, Metagross and Sableye.