Galarian Moltres & IoA Wailord
First, fly to the Isle of Armor at Fields of Honor train station point.
Don’t move your character and don’t change the camera angle.
Save your game. You should be like this.
Once the result is found, you should go and search for Moltres (or Wailord) in the sea around the island. Don't fly in another location, or the encounter will be rerolled. If you fail to encounter it or you fail to catch it, 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_Moltres or IoA_Wailord 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 Moltres is Shiny Locked, but it can be hunted for IVs, Nature and Marks. Wailord can be shiny.
Go back to the Bots tab, select SWSH_OverworldScan, click Add then Start All.