Rank every regions Pokémon from worst to best.

Mine:

7. Alola.
6. Sinnoh.
5. Hoenn.
4. Unova.
3. Kalos.
2. Kanto.
1. Johto.

my preference:

Alola < Sinnoh < Kalos < Kanto < Unova < Hoenn < Johto

Though there are good pokemon I like from every region.

Mine:

7). Alola
6). Kalos
5). Johto
4). Unova
3). Kanto
2). Hoenn
1). Sinnoh

7. Johto
6. Kanto
5. Kalos
4. Unova
3. Alola
2. Hoenn
1. Sinnoh

7. Alola
6. Kanto
5. Johto
4. Unova
3. Sinnoh
2. Hoenn
1. Kalos

7. Sinnoh
6. Alola
5. Kanto
4. Unova
3. Johto
2. Hoenn
1. Kalos

7. Kanto
6. Hoenn
5. Johto
4. Alola
3. Sinnoh
2. Unova
1. Kalos

7. Alola
6. Unova
5. Kalos
4. Johto
3. Kanto
2. Hoenn
1. Sinnoh

7. Alola- The Ultra Beasts are just weird, and I dislike Decidueye and Incineroar. They could have made much cooler designs for those. Some of the other pokemon are pretty nice though.
6. Sinnoh- The lengendaries are good, but otherwise there aren't many memorable pokemon here.
5. Unova- a mixed bunch, some great designs, some awful ones.
4. Johto- nothing much to say here, not the best, not the worst.
3. Hoenn- colourful, striking designs; this gen as a whole had a veryfun, colorful look.
2. Kalos- nearly all of these pokemon are nice designs!
1. Kanto- I have a nostalgic soft spot for the original 151. Nice simple designs, unlike some later gens.