Now that Aurumoth has a stat spread and artwork, I am excited to discuss its non-competitive movepool and competitive but flavourful moves.
Flavour-wise, Aurumoth has lots of potential in its features. Its staring eyes make me think Glare, Miracle Eye and Mind Reader would be a perfect fit. Mind Reader makes a lot of sense with No Guard too, since variants with the other abilities would then still be able to ensure they didn't miss their target.
Horn Leech and Horn Attack both fit very well with Aurumoth's antlers. I am not sure they're imposing enough for Megahorn though.
Its tail is perfect for Tail Glow, or if that gets deemed too powerful, it could be utilised for other purposes, like communicating via Signal Beam, creating a Light Screen, or shooting a Charge Beam. Simple Beam would also fit: "The user's mysterious psychic wave changes the target's Ability to Simple." It's tail might also allow it to Charge, and there is precedent for a non-Electric pokemon getting this in the Klinklang line.
Its wings look like they could rustle up a Silver Wind, or even a Hurricane (after all, Volcarona learns it too). Their golden colour suggests maybe Reflect, Mirror Shot or Mirror Coat. Its angelic aspect suggests it could Healing Wish, Quiver Dance or Lunar Dance.
It is a shame Doom Desire is banned, and is now Steel-typed, because its decription makes it sound close to a Light-typed move as Pokemon is every going to get: "Two turns after this move is used, the user blasts the target with a concentrated bundle of light." It also conjures visions of heavenly wrath that fit perfectly with Aurumoth's golden, angelic aspects. Luster Purge is also banned as a legendary signature move, but it is Psychic-typed and sounds rather angelic "The user lets loose a damaging burst of light. It may also reduce the target's Sp. Def stat." Power Gem is another move that references a ray of light, and several non-Rock types like Ampharos and Vespiquen get it, presumably related to Ampharos' glowing tail and Vespiquen's bindi!
You might this is a frivolous topic, and it is, but it will also be a useful place for movepool creators to come get ideas for the flavour aspect of their movepools.
If I haven't seen further, it's because giants were standing on my shoulders...