Yes, you can catch the shiny version of Grubbin in Pokemon GO, following its addition to the game on September 23, 2023.
Any Grubbin you encounter in Pokemon GO, whether that is from a wild spawn or as a Research reward, has a very low chance of being shiny.
If you are searching for a shiny Grubbin, there’s no better time to catch one than during the September 2023 Pokemon GO Grubbin Community Day event. This is because Grubbin will be spawning in the wild much more frequently.
Grubbin Shiny Odds
The odds of Grubbin being shiny in Pokemon GO are 0.2%, or 1 in 500. This is the standard shiny odds for Pokemon.
This shiny rate means that, on average, you’ll need to encounter 500 Grubbin before you find the shiny version.
What Color is Shiny Grubbin?
The shiny version of Grubbin has a red head, red pincers, and a gray face. This makes it stand out from the standard version of Grubbin, which has an orange head and pincers, and a brown face.
However, both versions of Grubbin have a white body.
How to Get Shiny Charjabug & Vikavolt in Pokemon GO
The only way to get the shiny versions of Charjabug and Vikavolt in Pokemon GO is by evolving a shiny Grubbin.
You need 25 Grubbin Candy to evolve a shiny Grubbin into a shiny Charjabug. Then, you need a further 100 Grubbin Candy to evolve a shiny Charjabug into a shiny Vikavolt.
The shiny version of Charjabug is bright red. Meanwhile, the shiny version of Vikavolt is silver with a red face and bright green pincers.