How to beat Ho-Oh, Mewtwo Legendary Raids in Pokémon Go

Pokémon Go Legendary Raids are in full effect. The Legendary Beats: Raikou, Entei, and Suicune are winding down but EX Raids featuring Mewtwo are coming out of field-testing mode and, for a limited time only, Ho-Oh is available. (And who knows when Mew and Celebi will follow?)But, in order to catch a Legendary Pokémon, you have to beat them first.

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How to beat Ho-Oh, Mewtwo Legendary Raids in Pokémon Go