Shiny Dunsparce Guide Pokémon Go will teach you everything you need to catch it.
Shiny Dunsparce Guide Pokémon Go: Rarity
Shiny Pokémon don't appear on your overworld map: you have to actually encounter them first to see if they're Shiny. You should encounter a Shiny Pokémon once every 450 encounters, but it's unknown if the event will boost Dunsparce. If it does, you might see a chance in about 130 encounters.
Shiny Dunsparce Guide Pokémon Go: How to Find and Catch
A Shiny Dunsparce has pink stripes and accents instead of blue. When you find a Shiny, you'll also see sparkle over the Pokémon to notify you. Other than appearances, Shiny Pokémon are captured just like how you would get the normal forms.
Shiny Dunsparce Guide Pokémon Go: Counters
How good is Dunsparce in battle? It's just okay. The big thing going for it is that it's a Normal type that learns Bite, which makes it effective against any Ghost type opponents. If you're fighting Dunsparce, a good Fighting type move will just put it down. Just don't send any Ghosts against it.