Shuppet will be in the Spotlight on October 20. It will become more common for just an hour at 6 p.m. in your local time. In addition to finding more Shuppet, you'll also get double transfer Candy.
Can Shuppet Be Shiny in Pokémon GO?
The Spotlight Hour event won't make finding Shiny Shuppet any easier. Unlike Community Day events, you won't get an increased rate to find Shiny versions of the featured Pokémon. You will find more Shuppet, but you'll still only find a Shiny Shuppet roughly once every 450 times.
You won't know which Pokémon are Shiny until you go to encounter them, as they don't appear different on the map. Once you've found a Shiny Shuppet, you'll get the trademark Shiny sparkle next to the name tag. Of course, the Pokémon will also be a different color.
A Shiny Shuppet is blue instead of purple. When it evolves into Banette, it keeps the blue color.
Banette is a decent Ghost-Type that can function like a worse Gengar. Get a Shiny one for your collection, as there are better Ghost-Types you can use in battle.