Even in its original game, Phanpy was hard to come by, nevertheless its shiny. It was exclusive to Pokemon Silver, and even then it could only be caught at Route 45.

Tonight is Phanpy Spotlight Hour in Pokémon GO. Read up on the hour's bonus and whether or not this Pokémon can be Shiny at Bleeding Cool.

So for this example, let’s say you find a Shiny Phanpy. Who wouldn’t want that? But you want another for some reason. So, you go to the Phanpy, catch it, then race to the nearest town.