The process of doing prevos has been a little convoluted, to say the least. It's a flavor procedure for fun that wasn't standardized until recently, and it's liable to change again. That said, we do have some info on how Necturine evolves here and on how Scratchet evolves here. I don't think we have ever officially "voted on" per se the method of evolution specifically. In these cases, Deck Knight and jas61292 provided movepools that won and contained stated evolution methods. That's good enough for me.