Aw man, Jiggs, Clefable, and Ninetales? This is a toughie. Jiggy was my favorite when I was a kid and it's still relevant thanks to Smash. Clefable is a cutie and I had fun using it in gen 4. Ninetales is cool of course, though it was never quite cool enough to use until it got Drought and it made for a fun sun team.
I think Nidoran M is the only Nido that I like. Its design is just right, while 'rino and the whole F line look a little off and kinda dopey for some reason. 'King is cool, but idk, I don't care about him.
...Fuck it, Jiggy.