464 Rhyperior

Smack Down is superior to Mud Slap in terms of damage output, however the latter provides different type coverage, which can be more preferable depending on how the player wants to use Rhyperior. Both fast moves suffer from below average energy generation. 

Rock Wrecker is a Community Day exclusive move, and is highly recommended for its incredible damage output and very high DPE value. Stone Edge is a direct downgrade in both power and energy cost. Surf ties for the least amount of energy cost, and deals respectable damage. Superpower provides wide coverage, however its self-debuff effects makes it more difficult to use. Earthquake and Skull Bash demand too much energy to use, given Rhyperior's slow energy gains. 

Rhyperior as a Ground/Rock Pokemon is difficult to use in Great League with the ubiquity of Water and Grass-type Pokemon. While its charge moves are very favorable and its stat distribution relatively average, the major liability of being doubly weak to Water and Grass makes it way too risky to use, especially when considering other competitors in its role. 

Rhyperior's typing and moveset is less relevant in a meta dominated by Giratina. While it can be quite effective against popular Steel-types, other Pokemon can fulfill this role without Rhyperior's two double weaknesses. 

Rhyperior generally prefers Mud Slap in this format, making it a super powerful answer to the ever-prevalent Steel-types. Notably, with one shield invested, it can farm Dialga all the way down! Of course, be careful of the ever-prevalent Kyogres, but Rhyperior can be a really strong pick!