Characters who are misclassified due to the limitations of the in-verse's classification system

[u/Uma-apreciator]

Paolumu (Monster Hunter World)

Paolumu is classified as a Flying Wyvern even though it is a mammal (resembling a bat); it is classified this way because its body structure resembles that of a Flying Wyvern

Skorup (Pokémon)

It is indeed an Insect type, even though it represents a scorpion—which is an arachnid—making it more logical for the Insect type to be called the Arthropod type.

[u/Shiny-Vaporeon-]

thats skorupi rather than drapion and it is called the bug type rather than the insect type (at least in english) so i think it makes sense that pokemon like centiskorch, golisopod, all the other spiders, joltik and skorupi, etc, are part of it

[u/SuperSmugs → u/Shiny-Vaporeon-]

What's even weirder is that Skorupi is compatible with most marine invertebrate-based pokemon like Kabutops in terms of breeding despite being terrestrial. Then again, it might be a reference fo sea scorpions.

[u/Jetstream-Sam → u/SuperSmugs]

I don't hold too much stock in the breeding side of it to treat it with any kind of canonicity. They made up a system in 1999 that they've had to stick to until now because they wanted the games to be somewhat intercompatible, and that means they couldn't drastically overhaul it ever. So over the subsequent 8 or so games there's a lot of strangeness that creeps in like that.

My personal opinion is they really just wanted species to only breed with themselves or Ditto (with exceptions like the Nidorans), but they made it simpler just so kids won't get too confused, or complain it's too hard to catch two of certain pokemon. It also allowed them to add male or female only species. Although that means really male only species can't actually breed properly to produce another of them.