Which “Untouched” Gen 3 Pokémon are Still the Most Useful?

The Pokémon from the Hoenn region are pretty spectacular, and many of them have gotten spruced up over time with new evolutions, Megas, and regional forms, but there are actually a great multitude of Pokémon from Gen 3 that have never seen any special treatment that are still pretty great, so let's see which ones sit on top of the pile as the best of the options that have stayed the same!