Shiny Helioptile and Tapu Koko make their debut during the Crackling Voltage event starting January 27th at 10am local time : r/TheSilphRoad

Crackling Voltage Event

Crackling Voltage Event - Leek Duck

Crackling Voltage Event

Bzzt! Shiny Helioptile and Shiny Tapu Koko bring the thunder in the Crackling Voltage event; Team GO Rocket activity also detected – Pokémon GO

Bzzt! Shiny Helioptile and Shiny Tapu Koko bring the thunder in the Crackling Voltage event; Team GO Rocket activity also detected – Pokémon GO : r/ TheSilphRoad

Pokemon Go Crackling Voltage Research and Event Guide - Pokemon GO Guide - IGN

Pokémon GO's Season of Mythical Wishes' Crackling Voltage event guide – Nintendo Wire

Crackling Voltage Event

*NEW* CRACKLING VOLTAGE EVENT IN POKEMON GO! Shiny Helioptile Hunt / I NEED SHINY TAPU KOKO!