Pokémon GO - The Best Regigigas Counters, How to Get Shiny Regigigas

After quite a bit of a break Regigigas has returned to Pokémon GO. And this time you can even catch Shiny Regigigas when you beat one in a raid. So
How to beat Regigigas and catch a shiny

Pokebattler's Regigigas Raid Guide

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Regigigas raid counters (LegendsLima) : r/TheSilphRoad

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Regigigas and Mega Altaria raid guides. Top general counters via pokebattler.com : r/TheSilphRoad