The term shiny was a fanon term until generation 4.

[Palamon]

The term "Shiny Pokemon" was not canon until generation IV with the legendary shiny beasts event. That being said what "fandom" terms in Pokemon do you use that aren't official?

 

[pkmin3033]

I have no idea...I didn't even know "shiny" wasn't a canon term until Gen IV! *looks up a list*

Elemental Monkeys, Pseudo-Legendary, Mascot, Dexit, Boss, Living Pokedex, EV Training, HM Slave, Nuzlocke, EVs/IVs, RNG (although this one is not Pokemon specific and does not originate from Pokemon so idk why it's on the list) and...lots of metagame terminology despite not being into the metagame. I'm not gonna list all those.

As a side note, I flat-out refuse to use the term "Mythical" to describe some Legendary Pokemon despite that being something that the franchise itself uses, and I will be in my cold grave before I called Sword and Shield "SwSh" because I loathe that contraction. As a Monster Hunter fan I automatically think "SnS" because I was a Sword and Shield user before I transferred to Light Bowgun. xD

 

[Sheep]

IV/EV are probably my biggest ones. I still forget they're not official terms but...I'm so used to them that I can't consider anything else at this point :catsad:

 

[AkameTheBulbasaur]

I never really understood why they had to differentiate between "Legendary" and "Mythical". I think Mythical is supposed to refer to event-only Pokemon, but that seems to be a pointless distinction. I mean, Deoxys used to be an event-only Pokemon, but then in ORAS you can just catch one during the Delta Episode. So is Deoxys no longer a Mythical? Are they a Legendary now because you can catch one normally (but only in one game)?

Anyway, it kinda surprised me that the terms "Signature Move/Ability" aren't official terms because I could have sworn that I had seen official media using it. For example, I thought that I had seen a promotional piece about some Legendary Pokemon claiming they had a Signature Move, but I must have just misremembered their phrasing. Maybe they said something like "special move" or "move unique to [POKEMON]." Or maybe I just made the whole thing up altogether, who even knows?