Pokémon GO Shiny Halloween Mischief Drifblim – Halloween Event 2021 – Trade 20.000 stardust (Read Describe)
You need
Stardust cost
How to get GPS coordinates
https://www.alphr.com/find-gps-coordinates-android/
https://www.idownloadblog.com/2017/12/20/how-to-find-gps-coordinates-iphone/