Regirock, the Rock Peak Pokémon, returns to Pokémon GO Tier 5 Raids with 42,768 Raid Boss CP. Trainers can exploit its weaknesses to Fighting, Grass, Ground, Steel, and Water-type attacks. Optimal counters include Crowned Sword Zacian, Mega Lucario, and Primal Groudon. Shiny Regirock is available, encouraging trainers to raid for a chance to catch its rare golden variant.