Many moons ago, Hariyama was pretty relevant to the meta as a fighting-type Pokémon, but it has since been overtaken by Pokémon like Lucario, Conkeldurr, Terrakion, and others. However ...

Pokemon GO Black Kyurem raids can be challenged ... Keldeo with Low Kick and Sacred Sword. Shadow Conkeldurr with Counter and Dynamic Punch. Mega Diancie with Rock Throw and Rock Slide Shadow ...