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 ...

Get the Pichu to low HP to increase the rate of it ... which which triples the rate Shiny Pokemon are found in the game. It can take quite a bit of time to find an Alolan Dugtrio in the game.