As unpopular as it is, I actually really like Aromatisse. I wanted to include it on my team since Coro Coro released Spritzee, but it ended up being on Y when I got X. I think it has an interesting design, despite what anyone says.
Goodra is freaking adorable. I just love its bubbly personality even after evolving, it's like an overgrown child! And its shiny is kind of cool too.
Gogoat makes for an interesting teammate, and I'm glad I used one in my playthrough team. He may be NU, but you'd be surprised how well he can pull his own weight in battle.
Aurorus is such a lovely Pokemon. I kept one in my playthrough team, and now even use one competitively. I've used one against higher tiers, and has been able to pull through quite a number of times! Aurora Dino is not one to underestimate
Hawlucha is another favorite for personal reasons. It's not just because I'm Mexican that Hawlucha really speaks to me, but because of personal family reasons that makes Hawlucha so valuable to me.
Lastly, Florges. She's so beautiful, and incredibly useful. Sure, she's doesn't have the best abilities in single battles, but she's still quite a monster if used properly.