"Golden" is a sub-color of yellow, yes? So, with that in mind, let's start with the list of yellow Pokemon from Bulbapedia's list.
A good chunk of these ones, unfortunately, I find to be gold in neither normal nor shiny forms. Note, also, the helpful color palette that FlappersFlappers shared with us:
That leaves us to relative few. I consider myself to have pretty good color perception, so here's by best crack at it.
There are relatively few Pokemon I would consider gold by default:
- Raichu (both forms, I think?)
- Dusk Mane Necrozma
- Umbreon, if you count the rings on its body
- Significant parts of Sigilyph, though its official artwork shows it off much more than the game sprites do.
- Dragonite (this thing is identified as brown by Pokedex terms!? This is a travesty that must be immediately rectified!)
- Note Girafarig has gone through several changes and it varies by generation whether it has any at all; the official artwork on Bulbapedia doesn't seem to match most instances of its game appearances or any of it in the anime.
So yeah, that's about it. Pretty sad.
- Joltik family
- All Lake Guardians: Azelf, Mesprit, Uxie
- Shiny Camerupt's old forms used to have gold rings at their sides, but no longer
- Larvitar and Tyranitar...might be closer to a darker yellow
- Shedinja, though starting in Gen 6 it's hardly noticeable
- Charmander (generation 2 to 5)
- Chaarmeleon (generation 3 to 5)
- Swablu family (duh I have one I should've remembered this)
- Shelmet family (head)
- Do we count Metagross in here?
- Clamperl and Gorebyss
- Rhyperior (Gen 6 onwards)
- Silvally especially, but Type: Null kinda as well
- Larvesta family
- Exeggcute family, including Alolan (Meme) form
- Milotic's large tail
- Stufful family? Or is that orange? Can't fully trust my eyes on that one.
Alright, so that's my best shot. Time for you, Pokemon Database, to yell at me for missing your favorite golden boi.