When you tought that CP6 had too many ultra rares, and then you see this. Talk about some major Ultra Rare Overload.
Honestly, these Hyper Rare cards feel totally unncecessary. Actually, maybe the regular Full Arts are the unnecessary ones. Like, GX pokémon already look like FA cards so, they could have made only one of the 2 variants instead to prevent this influx of ultra rare cards.
It's interesting though that the HRs have a rainbow coloring. The Rainbow game references keep piling up. (inb4 Rainbow Necrozma form)
As for the gold energy cards, my guess is there's a Metal one for Collection Sun, it just wasn't revealed yet. (seems obvious, Metal for Solgaleo, Psychic for Lunala). So, my guess is these gold energies will appear throughout the SM sets, with the types related to set mascots being the ones chosen to be included (similar to the specific-type special energies from XY). As an example, the next japanese sets focus on Tapu Koko and Lycanroc, so I expect the gold energies present to be Lightning and Fighting. Or course, I'll have to wait and see if there's indeed a Metal one in Collection Sun to sustain this.
Finally, and regarding energy cards, why the hell doesn't the english set include the basic energy cards? Theme deck exclusives, I guess.