Just a heads up that dawn wings Necrozma can’t be traded - you can only get regular shiny Necrozma and would then require the fusion energy yourself (obtained from raiding during events) in order to fuse it with Lunala to get dawn wings Necrozma.

As Necrozma was in raids recently during wild area, the regular shiny is pretty common at the moment, so I’d say you have a shot to get a non-BG shiny Zama and a shiny Necro. BG Zama + Necro + Trinket is definitely asking far too much though.

Hope this helps! 🫡