Welcome to the new gen of pokemon! I'm somewhat new, got Shield at the start of last month. XD
I'm no help with the event shiny, but I'd be happy to touch trade my zamazenta for your Zacian, and get you some Shield exclusives. :D I'll hop on and start get some 'mon for you.
Let me know what times you are available. :) I'm pretty much available all day after lunch UTC+8 (PST - USA)