>7st place: gen 1
Not bad, but it just has nothing special. Too boring in my opinion, no epic story with a legendary for example.
>6st place: gen 7
Solid. I miss gyms, I dont like the tropical theme, it has too long shortcuts. On the other side, the game has good pokemon designs and a very good story.
>5st place: gen 3
Pretty good. Just the average pokemon game, it has not many flaws but also not too much special...
4st place: gen 4
Very good. Extremely good and nostalgic music, nice story but not too much special. The amount of HMs, however, are very irritating.
3st place: gen 6
Very good. The addition of 3d pokemon and trainers was very amusing. There are some very good new pokemon like Greninja and Xerneas. The story was not too original sadly.
2st place: gen 5
Good music, good story. I like the animated pokemon sprites. I like it that they added more than 150 new pokemon.
1st place: gen 2
Almost perfect. The fact that pokemon follow you, you can visit Kanto after the game and the final battle with Red makes it a very worthy experience.