Joltik, a Pokémon from Unova, can be shiny in Pokémon Go, but it isn't particularly useful in PvP or PvE content. It's a collector's item.
The shiny rate for Pokémon on a regular day is about one in 500, and Joltik does not have a confirmed 'permaboost' shiny rate, making its appearance random.
Shiny Pokémon catch rates are influenced by developer Niantic and boosted during special events like Community Days, Safari Zones, or in Legendary Raids.
Currently, there are no consumable items which can enhance shiny Pokémon rates, leaving players to rely on chance for their collection efforts.
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