You know, looking at the Gen 5 roster, I think Druddigon is one of the neatest additions to the Gen 5 roster they included. While its massive roster generally has a hit-and-miss reception (some are disliked as expies), the later portion of the Pokedex has a lot of really good and original designs going from Sandile and beyond, and the later mons are all really cool and oftentimes really fun to use.
But Druddigon is a unique one that I feel is a nice addition, not because it looks standout or because it's particularly good, but because of the opposite: it's not particularly good in battle, being a rather average Pokemon, that while functionally good and usable, isn't particularly strong, and design wise it's not cute or cool looking in any way: it's unremarkable at best, ugly and repulsive at worst, as far as what it looks like, but that's also what makes it a neat Pokemon.
Why, you ask? Because it's a Dragon-type Pokemon, and for a Dragon-type to not be particularly powerful and to just be a usable, average Pokemon while also not standing out much in design makes it a unique addition to the Dragon-type roster and a unique twist on a type that usually has a very specific vibe. Usually Dragon-types are the cream of the crop, the strongest of the lot, and are either legendaries (Rayquaza, Sinnoh and Unova cover legendaries, Zygarde, Eternatus, Raidons), sub-legendaries (Latis), pseudo-legendaries (most of them except Tyranitar and Metagross), or Ultra Beasts and Paradoxes. And the ones who aren't still have high BSTs usually 500 and above, and have striking designs: think Kingdra, Flygon, Altaria, Haxorus, Noivern, Duraludon/Archaludon, and Tatsugiri. These Pokemon are usually hard to obtain, either being Legendaries who only appear once and have a low catch rate, or pseudo-legendaries and even normal ones being rare, high-investment, and high reward. Design-wise, many of them are striking. They're badass, like Salamence or Garchomp, or cute, like Dragonite, Goodra, and the Latis, or elegant like Altaria, and so on and so forth.
While that's a cool aspect of them, it makes Druddigon a neat addition because it's none of that. It's average with a BST of 485, and it has no evolution line which means what you see is what you get: nothing evolves into it, and it doesn't become anything stronger. It's not super rare either, being a relatively common spawn around Dragonspiral Tower and just being kinda there. This basically makes Druddigon the "common man's Dragon-type", one where there's no particularly standout traits, and it's just an ordinary Pokemon. For a type that's often exotic, powerful, and larger-than-life, Druddigon being so average and down-to-earth is a neat twist on a type's trope.
