My four favorites for this generation:
Rankurusu
Zeburaika
Kirikizan
Daikenki
For one of them (Zeburaika), it's more their pre-evolutions than them, but still.
For the record, I know Kirikizan is Black exclusive and Rankurusu is White exclusive, but I'm getting both, so it doesn't matter. What does matter, however, is figuring out how to work in Warubiaru and Shinpora into my teams, which I also like.
Speaking of those I like but don't love, there are also:
- Swanna
- Mebukijka
- The Elemental monkeys
- Gigigear
- Tsunbeaa
- Kojondo
- Emboar
- Gigaiasu