Joltik does not have a Shiny Form available in Pokémon Go as of April 2020. In general, once a Shiny version of a Pokémon is released, be it for an event or otherwise, it will then become available in general encounters. The Buddy Up event brings increased spawns for several Pokémon, including Joltik, but will not be introducing a Shiny form for most of them.
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