I traded myself a shiny Latias today for 40k X 2. I have a level 36 a different color that I never use that got it (only two operational phones currently). I traded a Feb 2017 Vaporeon 2850 cp or it...didn’t go lucky, but 8a/10/6 and 2499 at level 26.5.
Yesterday I got a lucky 533 shiny Clamperl, my level 39 main backup account got a lucky Latias 1992.
Total I’ve done 16 special trades that went lucky. Only consistent stategy though: the easy T5 bosses I would do them by myself near work, then trade with ones I’ve caught 12km away near home.