From Bulbapedia, the community-driven Pokémon encyclopedia.
I created this (unfinished) table for an article about Type Origin I want to be on Bulbapedia. I need to put it somewhere else I think, but I guess it'll be fine here for now:
|| Aura/Martial Arts
|| Evil (Dark)/Disaster/Negativity
|| Bioelectrogenetic Animals
|| Shocking/Charging/Draining Electricity
|| Electric(ity)/Energy/Static Electricity/Light**
|| Robots/Knights and Other Armored Warriors
|| Industry/Artificial Environments
|| Living or Resurrected Fossils
|| Polar Animals
|| Polar Regions/Frozen Landscapes
|| Mind Reading/Future Seeing/Mind controlling
|| ESP(er) (Psychic)/Mind/Spirit/Time/Genetics/Emotions
|| Burning/Heating/Fire Spitting
|| Fire (Flames)/Magma/Heat
|| Fishes and Other Aquatic Animals
|| Plants and Mushrooms
|| Passing Through Objects/Scaring
|| Fairies/Magical Beings/Elves/Angels/Cute Beings
|| Insects, Arachnids and Gastropods/Bugs
|| Living Waste
- A Pokémon’s type is decided by:
- What for kind of being the Pokémon is (based on).
- What for kind of action the Pokémon (is able to) perform(s).
- What for kind of element the Pokémon (partially) consists of, possesses, represents or contains.
- What for kind of environment the Pokémon lives in, is commonly found in, protects, represents or rules over.
- Sometimes a Pokémon would get more than three types, considering the above list; in that case the two most important features of a Pokémon are taken into consideration. (Charizard; Beedrill) Exceptions are when the balance or expansion of the type combination chart is more in favor. (Stunfisk)
- Sometimes a dual-type Pokémon is partially Normal-type because the powers of the other type are (design-wise) focused onto one spot of its body. (Pyroar has its Fire focused in its manes; Sawsbuck has its Grass focused in its wooden horns.)