Which "Untouched" Gen 4 Pokémon are Still the Most Useful?

The Sinnoh region provided many Pokémon that were already updates to past entries with evolutions or babies, but there were still plenty more that have seen no updates since Diamond and Pearl, and even more that haven't even seen so much as a significant story arc and have really been left behind in terms of any attention, but these Pokémon are still great, so let's shine a light on these underrated beauties and see if we can bolster their profiles on our own!