Which type makes up the majority of Pokemon in Sun/Moon?

Question

As I stated, which type (water, fire, etc.) of Pokemon make up the majority of Pokemon in the latest games, Sun and Moon?

Answer 1

Water

Counting manually using Bulbapedia's Handbook Pokedex, Using the 'Refine' function to restrict the list by type, Water has 60 entries in Sun/Moon, higher than all other types. Flying comes in second at 50.

This includes different formes of the same Pokemon that may share a Pokedex number as well as event exclusives.

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This also holds true for the National Pokedex. According to Bulbapedia's entry on the Water type:

As of Generation VII, there are 133 Water-type Pokémon or 16.6% of all Pokémon (counting those that are Water-type in at least one of their forms), making it the most common of the eighteen types.

This is followed by Normal type in 2nd place:

As of Generation VII, there are 109 Normal-type Pokémon or 13.6% of all Pokémon, making it the second most common type after Water.

As for the least-used type, that would be Ice:

As of Generation VII, there are 40 Ice-type Pokémon or 5.0% of all Pokémon (counting those that are Ice-type in at least one of their forms, including Alola Forms), making it the rarest type.