PhillyBeatzU on X: Type Combinations that are not used in Pokemon. / X

Imgur: The magic of the Internet

A chart with what type combinations are missing and an example for each comb there is already - 9GAG

Unused type combinations Gen V by AdeptCharon on DeviantArt

Type Combinations for Pokemon X and Y

Ranking the 5 best Pokémon type combinations - Dot Esports

All unused Pokemon type combinations so far, Pokémon

Fake Pokémon — Unused Type Combinations as of Gen 9

Pokémon: These Type Combinations Still Aren't Used

The Rarest Pokemon Type Combinations

Unused type Combinations Gen 1-7 : r/PokemonSwordAndShield