Keen Eye according to type distributions:

Normal:

1. Pidgey
2. Pidgeotto
3. Pidgeot
4. Spearow
5. Fearow
6. Farfetch'd
7. Sentret
8. Furret
9. Hoothoot
10. Noctowl
11. Starly
12. Chatot
13. Patrat
14. Watchog
15. Rufflet
16. Braviary
17. Pikipek
18. Trumbeak
19. Toucannon
20. Glameow

Flying:

1. Pidgey
2. Pidgeotto
3. Pidgeot
4. Spearow
5. Fearow
6. Farfetch'd
7. Hoothoot
8. Noctowl
9. Skarmory
10. Wingull
11. Pelipper
12. Starly
13. Chatot
14. Ducklett
15. Swanna
16. Rufflet
17. Braviary
18. Pikipek
19. Trumbeak
20. Toucannon
21. Rookidee
22. Corvisquire

Fighting:

1. Hitmonchan

Dark:

1. Sneasel
2. Sableye
3. Stunky
4. Skuntank
5. Drapion

Ice:

1. Sneasel

Steel:

1. Skarmory

Water:

1. Wingull
2. Pelipper
3. Ducklett
4. Swanna

Ghost:

1. Sableye

Psychic:

1. Espurr
2. Meowstic

Rock:

1. Rockruff
2. Lycanroc

Poison:

1. Stunky
2. Skuntank
3. Skorupi
4. Drapion

Bug:

1. Skorupi

Edit(01.01.2020): Added Sword and Shield additions.