Pokémon Crystal walkthrough

20 parts, one per checkpoint Pokémon Crystal’s own documentation defines: the areas each one opens, the wild Pokémon and trainers in them, and the fight at the end of it. Everything here is read off the game’s own files, so anything it doesn’t state isn’t claimed.

1. Part 1: Just started — no badges

   24 areas · 165 trainers · Rival Silver (Chikorita), Rival Silver (Cyndaquil), Rival Silver (Totodile)

2. Part 2: Beat Falkner — Violet City Gym, badge 1

   1 area · 3 trainers · Falkner

3. Part 3: Beat Bugsy — Azalea Town Gym, badge 2

   2 areas · 7 trainers · Bugsy

4. Part 4: Beat Whitney — Goldenrod City Gym, badge 3

   18 areas · 117 trainers · Rival Silver (Chikorita), Rival Silver (Cyndaquil), Rival Silver (Totodile) and 1 more

5. Part 5: Beat Morty — Ecruteak City Gym, badge 4

   5 areas · 16 trainers · Morty

6. Part 6: Beat Chuck — Cianwood City Gym, badge 5

   1 area · 5 trainers · Chuck

7. Part 7: Beat Jasmine — Olivine City Gym, badge 6

   1 area · 1 trainer · Jasmine

8. Part 8: Beat Pryce — Mahogany Town Gym, badge 7

   2 areas · 6 trainers · Pryce

9. Part 9: Beat Clair — Blackthorn City Gym, badge 8

   3 areas · 17 trainers · Clair, Champion Lance, Elite Four Bruno and 6 more

10. Part 10: Beat the Elite Four and the Champion

    39 areas · 107 trainers · Rival Silver (Chikorita), Rival Silver (Cyndaquil), Rival Silver (Totodile)

11. Part 11: Beat Lt. Surge — Vermilion City Gym, badge 9

    1 area · 4 trainers · Lt.Surge

12. Part 12: Beat Sabrina — Saffron City Gym, badge 10

    1 area · 5 trainers · Sabrina

13. Part 13: Beat Misty — Cerulean City Gym, badge 11

    1 area · 4 trainers · Misty

14. Part 14: Beat Erika — Celadon City Gym, badge 12

    1 area · 6 trainers · Erika

15. Part 15: Beat Janine — Fuchsia City Gym, badge 13

    1 area · 5 trainers · Janine

16. Part 16: Beat Brock — Pewter City Gym, badge 14

    1 area · 2 trainers · Brock

17. Part 17: Beat Blaine — Seafoam Islands Gym, badge 15

    1 area · 1 trainer · Blaine

18. Part 18: Beat Blue — Viridian City Gym, badge 16

    1 area · 1 trainer · Blue

19. Part 19: Beat Red on Mt. Silver

    3 areas · 1 trainer · Champion Red

20. Part 20: areas the documentation doesn’t place

    5 areas

It also doesn't say when 5 of its areas open up, so they are listed together in the last part rather than guessed into the story.

What you can catch at each checkpoint · Every area