Pokémon Data Answer · Dataset v1.0.0
Water is the most common type in the Otaku Data Viz snapshot of 1,025 species from Generations I–IX. The answer is the same under two different counting rules, but the exact total depends on whether secondary types count.
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Water appears on 154 of the 1,025 species when a type counts in either the primary or secondary slot. Water is also the largest primary-type group, with 134 species. These totals use each species' default variety and cover National Pokédex numbers 1 through 1025.
Water in either slot
15415.0% of species have Water as a primary or secondary type.
Water as primary type
134Water also leads when every species belongs to exactly one primary-type group.
Rarest in either slot
Ice · 48Ice appears on the fewest species when both type slots count.
Dual-type species
526Dual typing is why the any-slot column adds up to more than 1,025.
| Type | Either type slot | Primary type | Share of species |
|---|---|---|---|
| Water | 154 | 134 | 15.0% |
| Normal | 131 | 118 | 12.8% |
| Grass | 127 | 103 | 12.4% |
| Flying | 109 | 9 | 10.6% |
| Psychic | 102 | 60 | 10.0% |
| Bug | 92 | 83 | 9.0% |
| Poison | 83 | 42 | 8.1% |
| Fire | 81 | 66 | 7.9% |
| Ground | 75 | 40 | 7.3% |
| Rock | 74 | 58 | 7.2% |
| Fighting | 73 | 40 | 7.1% |
| Dragon | 70 | 37 | 6.8% |
| Dark | 69 | 45 | 6.7% |
| Electric | 69 | 59 | 6.7% |
| Ghost | 65 | 35 | 6.3% |
| Steel | 65 | 36 | 6.3% |
| Fairy | 64 | 29 | 6.2% |
| Ice | 48 | 31 | 4.7% |
The either-slot count answers how many species have a type at all. A Water/Flying species contributes once to Water and once to Flying, so the 18 type totals add up to 1,551 rather than 1,025. No species is counted twice within the same type.
The primary-type count assigns every species to only the first type on its default variety. Those 18 groups add up to exactly 1,025 and match the grouping used by the Pokédex Type Treemap.
Flying appears on 109 species when secondary types count, placing it fourth overall. Only nine species use Flying as their primary type in this snapshot, placing it last under the treemap's primary-type grouping.
That contrast is why a claim such as “the rarest Pokémon type” is incomplete without a stated counting method. Ice is rarest by either-slot coverage, while Flying is the smallest primary-type group.
The dataset contains one record for each species from Bulbasaur through Pecharunt, National Pokédex numbers 1–1025, spanning Generations I–IX. It uses the default variety for each species.
The page is versioned because the Pokédex continues to change. Newly announced species, later National Pokédex numbers, alternate forms, regional forms, Mega Evolutions, and other non-default varieties are outside this result until the canonical dataset is deliberately updated and reviewed.
Dataset 1.0.0 · Reviewed 2026-08-10
Counts are recomputed from the 1,025 unique species records in the canonical Pokémon Species Treemap Dataset. The either-slot calculation counts each species once for every distinct type in its types array. The primary calculation counts only primaryType. Percentages divide either-slot counts by 1,025 and round to one decimal place.
Water. It appears on 154 of 1,025 species when either type slot counts and is the primary type for 134 species in dataset v1.0.0.
A ranking can count a type in either slot or assign each species only to its primary type. Ice appears on the fewest species under the first rule, while Flying is the smallest primary-type group.
The either-slot total counts dual-type species in both of their type categories. The primary-type column assigns every species to one category and therefore adds up to exactly 1,025.
No. The snapshot contains one record per National Pokédex species and uses its default variety. Alternate and regional forms are not separate records.
Yes. The page is tied to dataset version 1.0.0 and National Pokédex #1–1025. A later reviewed dataset version may add species or change type assignments.
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