Galarian Zapdos
First, fly to East lake Axewell just under Motostoke.
Don’t move your character and don’t change the camera angle.
You should be like this and you might already see Galarian Zapdos in front of you. Save your game.
Save your game. You should be like this.
Once the result is found, you should go and search for Zapdos in the Wild Area zone around Lake Axewell. Don't fly in another location, or the encounter will be rerolled. If you fail the encounter, you can restart your game, the encounter will remain the same.
First, download the Sys-EncounterBot: https://github.com/Manu098vm/Sys-EncounterBot.NET/releases.
Go in the Hub tab and select G_Zapdos under SWSH_OverworldScan.
Scroll to ConsoleLanguage under FeatureToggle and set it to your language.
Scroll to StopConditions and set them according to what you're looking for.
Please note that Zapdosis Shiny Locked, but it can be hunted for IVs, Nature and Marks.
Go back to the Bots tab, select SWSH_OverworldScan, click Add then Start All.