Question

What are the all of the Unused Dual Type Combinations?

Comments

What? Please explain, I don't understand your question.

Answer 1

Updated as of Gen 8

---

Unused Type Combinations

/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/

---

Type Combinations used by Legendary Pokémon only

/
/
/
/
/
/
/

---

Used by Mega Evolutions only

/
/

---

Used by alternate forms only

/
/
/
/
/
/
/
/
/
/
/
/
/

---

Source

If you're reading this answer in the future and the sprites seem broken / not working, then please notify me on my wall or comment here.

Hope this helps!

Answer 2

I assume you mean dual types that don't yet exist. Correct me if I'm wrong. Here's a list:

Normal\Bug
Normal\Poison
Normal\Ice
Normal\Rock
Normal\Ghost
Normal\Steel

Fire\Grass
Fire\Ice
Fire\Fairy

Electric\Fighting
Electric\Poison
Electric\Dark

Ice\Poison
Ice\Bug

Ground\Fighting
Ground\Fairy

Rock\Ghost

Steel\Poison

Bug\Psychic
Bug\Dark
Bug\Dragon

Fighting\Fairy

Poison\Psychic
Poison\Fairy

Dark\Fairy

Tell me if I missed any.

EDIT 11/11/16- As of the recent leaks, Ice\Fighting, Rock\Poison, Rock\Electric and Ghost\Fighting now exist.

Comments

i know but alolan nidoking.

---

Alolan Nidoking has not been confirmed or found in the leaks, unfortunately. It was just a fan theory :(

---

i know im saying he  needs to add that on the list.

---

Im a girl. And there IS a poison\fighting pokemon, for the last time. It's Croagunk and Toxicroak from gen 4.

---

no. I was calling the nidoking  male.  and my mistake.