[Detailed] Ranking the best offensive & defensive Pokémon types

Offensive:

Note:
Deals Super Effective DMG against a typing = 2 points
Deals Normally Effective DMG against a typing = 1 point
Deals Not Very Effective DMG against a typing = 0 points
Ineffective against a typing = -1 point

Anything not mentioned will be assumed as Normally Effective. 18 total types.

Normal:
1/2 DMG to Rock, 1/2 DMG to Steel, Ineffective vs Ghost.

14 points

Fire:
1/2 DMG to Fire, 1/2 DMG to Water, 1/2 DMG to Rock, 1/2 DMG to Dragon, 2x DMG to Grass, 2x DMG to Ice, 2x DMG to Bug, 2x DMG to Steel.

18 points

Water:
1/2 DMG to Water, 1/2 DMG to Grass, 1/2 DMG to Dragon, 2x DMG to Fire, 2x DMG to Ground, 2x DMG to Rock.

18 points

Electric:
1/2 DMG to Electric, 1/2 DMG to Grass, 1/2 DMG to Dragon, 2x DMG to Water, 2x DMG to Flying, Ineffective vs Ground.

15 points

Grass:
1/2 DMG to Fire, 1/2 DMG to Grass, 1/2 DMG to Poison, 1/2 DMG to Flying, 1/2 DMG to Bug, 1/2 DMG to Dragon, 1/2 DMG to Steel, 2x DMG to Water, 2x DMG to Ground 2x DMG to Rock.

14 points

Ice:
1/2 DMG to Fire, 1/2 DMG to Water, 1/2 DMG to Ice, 1/2 DMG to Steel, 2x DMG to Grass, 2x DMG to Ground, 2x DMG to Flying, 2x DMG to Dragon.

18 points

Fighting:
1/2 DMG to Poison, 1/2 DMG to Flying, 1/2 DMG to Psychic, 1/2 DMG to Bug, 1/2 DMG to Fairy, 2x DMG to Normal, 2x DMG to Ice, 2x DMG to Rock, 2x DMG to Dark, 2x DMG to Steel, Ineffective vs Ghost.

16 points

Poison:
1/2 DMG to Poison, 1/2 DMG to Ground, 1/2 DMG to Rock, 1/2 DMG to Ghost, 2x DMG to Fairy, 2x DMG to Grass, Ineffective vs Steel.

14 points

Ground:
1/2 DMG to Grass, 1/2 DMG to Bug, 2x DMG to Fire, 2x DMG to Electric, 2x DMG to Poison, 2x DMG to Rock, 2x DMG to Steel, Ineffective vs Flying.

19 points

Flying:
1/2 DMG to Electric, 1/2 DMG to Rock, 1/2 DMG to Steel, 2x DMG to Grass, 2x DMG to Fighting, 2x DMG to Bug.

18 points

Psychic:
1/2 DMG to Psychic, 1/2 DMG to Steel, 2x DMG to Fighting, 2x DMG to Poison, Ineffective vs Dark.

16 points

Bug:
1/2 DMG to Fire, 1/2 DMG to Fighting, 1/2 DMG to Poison, 1/2 DMG to Flying, 1/2 DMG to Ghost, 1/2 DMG to Steel, 1/2 DMG to Fairy, 2x DMG to Grass, 2x DMG to Psychic, 2x DMG to Dark.

14 points

Rock:
1/2 DMG to Fighting, 1/2 DMG to Ground, 1/2 DMG to Steel, 2x DMG to Fire, 2x DMG to Ice, 2x DMG to Flying, 2x DMG to Bug.

19 points

Ghost:
1/2 DMG to Dark, 2x DMG to Psychic, 2x DMG to Ghost, Ineffective vs Normal.

17 points

Dragon:
1/2 DMG to Steel, 2x DMG to Dragon, Ineffective vs Fairy.

16 points

Dark:
1/2 DMG to Fighting, 1/2 DMG to Dark, 1/2 DMG to Fairy, 2x DMG to Psychic, 2x DMG to Ghost.

17 points

Steel:
1/2 DMG to Fire, 1/2 DMG to Water, 1/2 DMG to Electric, 1/2 DMG to Steel, 2x DMG to Ice, 2x DMG to Rock, 2x DMG to Fairy.

17 points

Fairy:
1/2 DMG to Fire, 1/2 DMG to Poison, 1/2 DMG to Steel, 2x DMG to Fighting, 2x DMG to Dragon, 2x DMG to Dark

18 points

OFFENSIVE RANKINGS:
1. Ground/Rock - 19 points
2. Fire/Water/Ice/Flying/Fairy - 18 points
3. Ghost/Dark/Steel - 17 points
4. Fighting/Psychic/Dragon - 16 points
5. Electric - 15 points
6. Normal/Grass/Poison/Bug - 14 points


Defensive:

Note:
Receives no DMG from a typing = 2 point
Receives Not Very Effective DMG from a typing = 1 points
Receives Normally Effective DMG from a typing = 0 points
Receives Super Effective DMG from a typing = -1 point

Anything not mentioned will be assumed as Normally Effective. 18 total types.

Normal:
2x DMG from Fighting, No DMG from Ghost.

1 point

Fire:
1/2 DMG from Fire, 1/2 DMG from Grass, 1/2 DMG from Ice, 1/2 DMG from Bug, 1/2 DMG from Steel, 1/2 DMG from Fairy, 2x DMG from Water, 2x DMG from Ground, 2x DMG from Rock.

3 points

Water:
1/2 DMG from Fire, 1/2 DMG from Water, 1/2 DMG from Ice, 1/2 DMG from Steel, 2x DMG from Electric, 2x DMG from Grass.

2 points

Electric:
1/2 DMG from Electric, 1/2 DMG from Flying, 1/2 DMG from Steel, 2x DMG from Ground.

2 Points

Grass:
1/2 DMG from Water, 1/2 DMG from Electric, 1/2 DMG from Grass, 1/2 DMG from Ground, 2x DMG from Fire, 2x DMG from Ice, 2x DMG from Poison, 2x DMG from Flying, 2x DMG from Bug.

-1 point

Ice:
1/2 DMG from Ice, 2x DMG from Fire, 2x DMG from Fighting, 2x DMG from Rock, 2x DMG from Steel.

-3 points

Fighting:
1/2 DMG from Bug, 1/2 DMG from Rock, 1/2 DMG from Dark, 2x DMG from Flying, 2x DMG from Psychic, 2x DMG from Fairy.

0 points

Poison:
1/2 DMG from Grass, 1/2 DMG from Fighting, 1/2 DMG from Poison, 1/2 DMG from Bug, 1/2 DMG from Fairy, 2x DMG from Ground, 2x DMG from Psychic.

3 points

Ground:
1/2 DMG from Poison, 1/2 DMG from Rock, 2x DMG from Water, 2x DMG from Grass, 2x DMG from Ice, No DMG from Electric.

1 point

Flying:
1/2 DMG from Grass, 1/2 DMG from Fighting, 1/2 DMG from Bug, 2x DMG from Electric, 2x DMG from Ice, 2x DMG from Rock.

0 points

Psychic:
1/2 DMG from Fighting, 1/2 DMG from Psychic, 2x DMG from Bug, 2x DMG from Ghost, 2x DMG from Dark.

-1 point

Bug:
1/2 DMG from Grass, 1/2 DMG from Fighting, 1/2 DMG from Ground, 2x DMG from Fire, 2x DMG from Flying, 2x DMG from Rock.

0 points

Rock:
1/2 DMG from Normal, 1/2 DMG from Fire, 1/2 DMG from Poison, 1/2 DMG from Flying, 2x DMG from Water, 2x DMG from Grass, 2x DMG from Fighting, 2x DMG from Ground, 2x DMG from Steel

-1 point

Ghost:
1/2 DMG from Poison, 1/2 DMG from Bug, 2x DMG from Ghost, 2x DMG from Dark, No DMG from Normal, No DMG from Fighting.

4 points

Dragon:
1/2 DMG from Fire, 1/2 DMG from Water, 1/2 DMG from Electric, 1/2 DMG from Grass, 2x DMG from Ice, 2x DMG from Dragon, 2x DMG from Fairy.

1 point

Dark:
1/2 DMG from Ghost, 1/2 DMG from Dark, 2x DMG from Fighting, 2x DMG from Bug, 2x DMG from Fairy, No DMG from Psychic.

1 point

Steel:
1/2 DMG from Normal, 1/2 DMG from Grass, 1/2 DMG from Ice, 1/2 DMG from Flying, 1/2 DMG from Psychic, 1/2 DMG from Bug, 1/2 DMG from Rock, 1/2 DMG from Dragon, 1/2 DMG from Steel, 1/2 DMG from Fairy, 2x DMG from Fire, 2x DMG from Fighting, 2x DMG from Ground. No DMG from Poison.

9 points

Fairy:
1/2 DMG from Fighting, 1/2 DMG from Bug, 1/2 DMG from Dark, 2x DMG from Poison, 2x DMG from Steel, No DMG from Dragon.

3 points

DEFENSIVE RANKINGS:
1. Steel - 9 points
2. Ghost - 4 points
3. Poison/Fire/Fairy - 3 points
4. Water/Electric - 2 points
5. Normal/Ground/Dragon/Dark - 1 point
6. Fighting/Flying/Bug - 0 points
7. Grass/Psychic/Rock - -1 point
8. Ice - -3 points

TOTAL RANKINGS (Offensive score + Defensive score):
1. Steel - 26 points
2. Fire/Ghost/Fairy - 21 points
3. Water/Ground - 20 points
4. Flying/Rock/Dark - 18 points
5. Electric/Poison/Dragon - 17 points
6. Fighting - 16 points
7. Normal/Ice/Psychic - 15 points
8. Bug - 14 points
9. Grass - 13 points

Note that this is strictly just based on type advantages/disadvantages, not a end-all-be-all of which is the best type. For example: many Steel types are extremely slow, and that is a huge disadvantage in battle. Many Electric types are extremely fast, and that is a huge advantage. This is not baked into the rankings.

Possibly will do a ranking baking all factors in eventually.