Type combinations according to amount of weaknesses:

One weakness:

1. Electric
2. Poison/Dark
3. Dark/Ghost
4. Normal
5. Water/Ground
6. Bug/Steel
7. Ghost/Dark
8. Normal/Ghost

Two weakness:

1. Ghost
2. Fairy
3. Electric/Flying
4. Steel/Flying
5. Water
6. Poison
7. Normal/Psychic
8. Normal/Fairy
9. Normal/Poison
10. Ground/Flying
11. Ground/Fire
12. Bug/Electric
13. Ghost/Fairy
14. Steel/Flying
15. Steel/Dragon
16. Steel/Fairy
17. Fire/Ground
18. Water/Flying
19. Water/Electric
20. Water/Dragon
21. Grass/Steel
22. Electric/Normal
23. Electric/Water
24. Electric/Fairy
25. Psychic/Ghost
26. Dark/Psychic
27. Electric/Poison
28. Poison/Steel

Three weakness:

1. Dragon
2. Steel
3. Psychic
4. Fire
5. Fighting
6. Ground
7. Flying
8. Bug
9. Dark
10. Normal/Flying
11. Normal/Water
12. Fighting/Psychic
13. Fighting/Dark
14. Fighting/Steel
15. Poison/Fighting
16. Poison/Water
17. Ground/Dragon
18. Rock/Bug
19. Bug/Rock
20. Bug/Fire
21. Bug/Water
22. Steel/Fighting
23. Steel/Rock
24. Fire/Flying
25. Fire/Steel
26. Fire/Water
27. Fire/Dragon
28. Water/Poison
29. Water/Steel
30. Water/Grass
31. Water/Fairy
32. Electric/Ghost
33. Electric/Steel
34. Electric/Fire
35. Psychic/Fighting
36. Psychic/Fairy
37. Ice/Steel
38. Dragon/Ground
39. Dragon/Fire
40. Dark/Normal
41. Dark/Fighting
42. Dark/Steel
43. Bug/Normal
44. Dark/Fairy
45. Electric/Fighting
46. Fire/Grass
47. Normal/Steel
48. Poison/Psychic

Four weakness:

1. Ice
2. Normal/Fighting
3. Normal/Ground
4. Normal/Dragon
5. Fighting/Flying
6. Fighting/Ghost
7. Flying/Dragon
8. Poison/Flying
9. Poison/Ground
10. Poison/Bug
11. Poison/Fire
12. Poison/Dragon
13. Ground/Steel
14. Rock/Poison
15. Rock/Water
16. Rock/Grass
17. Rock/Electric
18. Rock/Fairy
19. Bug/Fighting
20. Bug/Poison
21. Bug/Ground
22. Ghost/Poison
23. Steel/Ground
24. Steel/Ghost
25. Steel/Psychic
26. Fire/Normal
27. Fire/Fighting
28. Fire/Rock
29. Water/Rock
30. Water/Ghost
31. Water/Ice
32. Grass/Poison
33. Grass/Ground
34. Electric/Ground
35. Electric/Grass
36. Electric/Psychic
37. Electric/Ice
38. Electric/Dragon
39. Ice/Flying
40. Ice/Water
41. Ice/Fairy
42. Dragon/Flying
43. Dragon/Electric
44. Dragon/Fairy
45. Dark/Flying
46. Dark/Fire
47. Bug/Ice
48. Dark/Electric
49. Fire/Fairy
50. Fairy/Ground
51. Fairy/Poison
52. Fire/Ice
53. Ice/Normal

Five weakness:

1. Grass
2. Rock
3. Ground/Ghost
4. Rock/Flying
5. Bug/Flying
6. Bug/Ghost
7. Bug/Fairy
8. Ghost/Flying
9. Ghost/Fire
10. Ghost/Grass
11. Ghost/Dragon
12. Fire/Ghost
13. Water/Fighting
14. Water/Psychic
15. Water/Dark
16. Grass/Flying
17. Grass/Ghost
18. Grass/Fairy
19. Psychic/Flying
20. Psychic/Fire
21. Fire/Psychic
22. Ice/Ground
23. Ice/Ghost
24. Dragon/Fighting
25. Dragon/Ice
26. Dark/Dragon
27. Fairy/Flying
28. Bug/Dark
29. Bug/Dragon
30. Fairy/Fighting
31. Ice/Poison
32. Normal/Rock

Six weakness:

1. Normal/Grass
2. Fighting/Ice
3. Ground/Rock
4. Ground/Psychic
5. Ground/Dark
6. Rock/Ground
7. Rock/Ice
8. Rock/Dragon
9. Bug/Grass
10. Grass/Fighting
11. Grass/Dragon
12. Ice/Psychic
13. Dragon/Psychic
14. Dark/Ice
15. Bug/Psychic
16. Ground/Fighting
17. Ghost/Rock

Seven weakness:

1. Rock/Fighting
2. Rock/Psychic
3. Rock/Dark
4. Grass/Psychic
5. Grass/Dark
6. Psychic/Grass
7. Dark/Grass
8. Grass/Ice

Eight weakness: None.

1. 
   

Edit (08.08.2021): Corrected the Ice/Grass.