https://www.polygon.com/2018/7/19/17593586/pokemon-go-legendary-raid-battle-regice

Pokémon Go’s new Raid Battles feature the steel-type Registeel, the second of the legendary “Regi” Pokémon trio to enter the game. Registeel is available now until mid-August, ample time for hardcore trainers to grab one their complete collections.

Otherwise, we can’t blame you if this new Pokémon leaves you twiddling your thumbs until the next update launches. When the third-gen legendary Registeel’s cousin Regice launched in mid-June, players were unenthused by the Pokémon’s reveal. It’s not a great competitor in the metagame, and it’s not the most exciting Pokémon to carry around in your collection either. Registeel is much the same way; it’s a high-defense, low-speed monster that doesn’t have much else to offer.