For example, if you have a shiny Kyogre as your buddy, you’ll see a shiny Kyogre pop up on the overworld map. Once you tap it and catch the mimicking Pokémon, after it’s in the ball ...
Normal (left) vs Shiny (right). Credit reddit user skinnysnorlaz They won't appear as a different colour in the field, so you have to attempt to catch them first. They of course can also appear in ...