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Regirock is a legendary Rock Pokémon. It is vulnerable to Fighting, Ground, Steel, Water and Grass moves. Regirock's strongest moveset is Rock Throw & Stone Edge and it has a Max CP of 3,122.
"Regirock was sealed away by people long ago. If this Pokémon's body is damaged in battle, it is said to seek out suitable rocks on its own to repair itself."
The addition of Lock-On is a significant improvement for Regirock, featuring the best energy generation in the game with 5 EPT (Energy Per Turn). While its pitiful damage output of 1 DPT (Damage Per Turn) is often too low to farm down an opponent, the massive energy gains are needed for Regirock's expensive charge moves.
Stone Edge (100 Power/55 Energy) is the easiest to use, and a powerful option for general use. The legacy move Earthquake provides Regirock with excellent coverage when combined with Stone Edge, and is more reliable than Focus Blast. Focus Blast (150 Power/75 Energy) is a genuinely powerful but highly expensive option. Given these moves, Regirock is best used as a closer, as it appreciates not having to worry about opponents shielding its slow and imposing charged moves.
Regirock has a titanic defense stat and decent overall bulk. Its typing however, doesn't do it many favors, as it results in more weaknesses than resistances. While access to Lock-On enables Regirock to frequently use its powerful charge moves just like its Regi counterparts, Regirock tends to struggle more due to greater threats of fainting from its numerous weaknesses. Over it's still a good candidate for Great League, but lacking the resistances of Registeel is what sets Regirock back.
Regirock's high CP maxes out not far above the Ultra League cap, giving it very solid bulk in the tier. It can work very well as a Rock-type attacker and fills the niche that this brings very well, with extra coverage on ubiquitous Steel thanks to Focus Blast or Earthquake. It has many good matchups in the tier, but it's also dead weight against a large number of major threats.
Regirock is a solid generalist in the Master League thanks to its largely unresisted coverage and respectable stat product. It can act as a safe switch, denting just about everything that isn't Kyogre or Groudon, and can even be used to bait them out. Pairing Regirock with Palkia or Zarude can help take care of those issues. Although Rock is a poor defensive typing and leaves Regirock vulnerable to many common types, its impressive bulk and strong moveset often lets it fight back. While Regirock competes with Landorus when it comes to similar coverage, and with Mewtwo and Zacian when it comes to simply being a strong generalist, it can set itself apart from them thanks to its reliable matchups against Ho-Oh, Lugia, and Togekiss. Keep in mind that Regirock's fast move pressure is largely nonexistent, may struggle to efficiently finish off its targets.
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