Pokemon Type Combo Chart by twinkletoes-97 on DeviantArt

Unused type combinations by AdeptCharon on DeviantArt

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

Pokemon: Best Offensive Type Combinations

All Pokemon Type combination by ZarxielZerg on DeviantArt

What is the WORST Possible Pokemon Type Combination?

Type Combinations for Pokemon X and Y

The Rarest Pokemon Type Combinations

Pokémon: 10 Rarest Dual-Type Combinations

Best and Worst Dual Typings - Smogon University

Unused Pokemon Type Combinations: Which Are Missing?