Typings introduced each generation(post Gen I)

Generation II:

1. Water/Electric
2. Psychic/Flying
3. Rock
4. Grass/Flying
5. Water/Ground
6. Dark
7. Dark/Flying
8. Ghost
9. Normal/Psychic
10. Bug/Steel
11. Ground/Flying
12. Steel/Ground
13. Bug/Rock
14. Bug/Fighting
15. Dark/Ice
16. Fire/Rock
17. Ice/Ground
18. Water/Rock
19. Steel/Flying
20. Dark/Fire
21. Water/Dragon
22. Rock/Dragon

Retcons:

1. Electric/Steel

Generation III:

1. Fire/Fighting
2. Water/Grass
3. Grass/Dark
4. Bug/Water
5. Grass/Fighting
6. Bug/Ground
7. Bug/Ghost
8. Dark/Ghost
9. Steel
10. Steel/Rock
11. Fighting/Psychic
12. Water/Dark
13. Fire/Ground
14. Ground/Dragon
15. Rock/Psychic
16. Ground/Psychic
17. Rock/Grass
18. Rock/Bug
19. Ice
20. Ice/Water
21. Steel/Psychic
22. Dragon/Psychic

Generation IV:

1. Grass/Ground
2. Water/Steel
3. Normal/Water
4. Rock/Steel
5. Ghost/Flying
6. Poison/Dark
7. Ghost/Dark
8. Dragon/Ground
9. Fighting/Steel
10. Poison/Bug
11. Poison/Fighting
12. Grass/Ice
13. Psychic/Fighting
14. Ice/Ghost
15. Electric/Ghost
16. Steel/Dragon
17. Fire/Steel
18. Ghost/Dragon
19. Flying

Generation V:

1. Psychic/Fire
2. Ground/Steel
3. Ground/Dark
4. Fire/Psychic
5. Dark/Fighting
6. Normal/Grass
7. Water/Ghost
8. Bug/Electric
9. Grass/Steel
10. Ghost/Fire
11. Ground/Electric
12. Ground/Ghost
13. Dark/Steel
14. Dark/Dragon
15. Bug/Fire
16. Steel/Fighting
17. Rock/Fighting
18. Dragon/Fire
19. Dragon/Electric
20. Dragon/Ice
21. Normal/Fighting

Retcons:

1. Electric/Fire
2. Electric/Water
3. Electric/Ice
4. Electric/Grass

Generation VI:

1. Normal/Ground
2. Fighting/Dark
3. Steel/Ghost
4. Dark/Psychic
5. Poison/Water
6. Poison/Dragon
7. Electric/Normal
8. Rock/Dragon
9. Rock/Ice
10. Fighting/Flying
11. Electric/Fairy
12. Rock/Fairy
13. Ghost/Grass
14. Flying/Dragon
15. Psychic/Ghost
16. Fire/Water

Retcons:

1. Fairy
2. Normal/Fairy
3. Psychic/Fairy
4. Fairy/Flying
5. Water/Fairy
6. Steel/Fairy
7. Grass/Fairy

Mega Evolutions:

1. Fire/Dragon
2. Electric/Dragon
3. Grass/Dragon
4. Dragon/Fairy

Generation VII:

1. Grass/Ghost
2. Fire/Dark
3. Fighting/Ice
4. Bug/Fairy
5. Water/Bug
6. Poison/Fire
7. Ghost/Ground
8. Ghost/Fairy
9. Normal/Dragon
10. Dragon/Fighting
11. Psychic/Steel
12. Rock/Poison
13. Fighting/Ghost

Regional variants:

1. Dark/Normal
2. Electric/Psychic
3. Ice/Steel
4. Ice/Fairy
5. Rock/Electric
6. Fire/Ghost

Ultra Burst:

1. Psychic/Dragon

Generation VIII:

1. Fairy/Steel
2. Fire/Bug
3. Rock/Fire
4. Ice/Bug
5. Electric/Poison
6. Electric/Dark
7. Bug/Psychic
8. Dark/Fairy
9. Psychic/Normal
10. Flying/Steel
11. Flying/Water
12. Dragon/Ghost

Regional variants:

1. Ice/Fire
2. Poison/Fairy

DLC:

1. Fighting/Water
2. Dark/Grass

DLC Regional  variants:

1. Poison/Psychic

Legends: Arceus:

Hisuian Regional Variants:

1. Normal/Ghost

Edit (01.01.2020): Added Sword and Shield changes.

Edit (10.01.2020): Added Urshifu Rapid-Style Strike's typing.
Edit (28.02.2020): Added Zarude's Dark/Grass.
Edit (20.06.2020): Added Galarian Slowbro's Poison/Psychic.

Edit (25.10.2021): Added Hisuian Zorua/Zoroark's Normal/Ghost. Corrected Nihilego's typing.