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Regirock 4-Player Raid Guide

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Tier 5 Raid Boss Guides
Title
Difficulty:

Requires specific high level counters or weather boost

HP15,000 ATK153.26 DEF293.09
CP Range
Lvl 20 1703 - 1784 Lvl 25 2129 - 2230

Notable Weather

Boosts Boss's Moves Boosts Counters' Moves
Rain, Partly Cloudy, Cloudy Snow, Sunny / Clear, Rain, Cloudy

Fast Move Difficulty

Move Difficulty
Rock Throw Intermediate
Rock Smash Intermediate
Lock-On Easy

Charge Move Difficulty

Move Difficulty
Stone Edge Intermediate
Focus Blast Easy
Zap Cannon Challenging

Overview

Regirock is as tough as rocks - which also means that it has 5 weaknesses, the most in the game among all single types and tied with Ice. As such, a plethora Pokemon can manage the 4-man run. However, keep in mind that the odds of having to relobby are pretty high due to Regirock's bulk, so be ready to get back into the fight ASAP.

It's work noting that the 3-player run is very possible, and even a duo given a perfect situation in theory, but this guide will focus on the 4-player run primarily.

Approach

Team composition

  • The three Hoenn Starter Mega Evolutions are the top options for this raid
    • Mega Sceptile has the highest DPS
    • Mega Swampert has the highest TDO
    • Mega Blaziken is behind the others, but it boosts Fighting Type moves while on the field
  • Steel, Fighting, and Grass Types tend to rise to the top here

Battling strategy

  • Re-entering is necessary; standard lineups shouldn’t need >1 re-entry

  • Dodging is mostly unnecessary but may help. Just make sure you don't do it so often that you eat into your DPS.

Note: "Good" movesets are not necessarily viable at the level indicated.

Best Raid Boss Counters

Supreme Mega Counters

Mega Sceptile Mega Sceptile
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The top DPS option among Mega Evolutions, Mega Sceptile also double-resists Zap Cannon and has decent average TDO as a direct result. It also boosts powerful counters like Kartana while on the field, giving it added utility while on the field.

Mega Swampert Mega Swampert
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The TDO option among the Hoenn Starter Mega Evolutions, Mega Swampert resists Rock Type movesets and Zap Cannon, which allows it to power through most of what Regirock can throw at it. Its one weak spot here is the fact that its Water Type Mega Evolution boost is a bit lackuster short of boosting a fellow Mega Swampert, making it a bit less useful for the raid group in general.

Mega Blaziken Mega Blaziken
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Mega Blaziken is powerful, but it falls short of Mega Sceptile for DPS, and far behind Mega Swampert for TDO. Honestly, its biggest draw for this raid is the fact that it boosts Fighting Type Pokemon while on the field, which is one of the strongest types for countering Regirock.

Good Mega Evolution Counters

Mega Blastoise Mega Blastoise
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A bit vanilla as a Water Type, and objectively worse than Mega Swampert, but still a solid option for this raid.

Mega Venu Mega Venusaur
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A good TDO option with solid average performance. While weaker than Mega Sceptile, its extra time on the field aided by its resistance to Fighting Type movesets allows it to spread around its Grass Type Mega Boost for a longer period of time, which can be devastating when multiple players are utilizing Kartana at the same time. On that note, its niche sort of goes out the window against Zap Cannon, as Mega Sceptile beats it on all metrics there. 

Mega Lopunny Mega Lopunny
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Another Fighting Type booster, but it's weak to Fighting Type moves itself. Mega Blaziken is better, but Mega Lopunny is a solid backup.

Mega Scizor Mega Scizor
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Definitely the weakest option on this list, it's only here by virtue of its ability to boost Shadow Metagross while on the field.

Supreme Counters

ShadowMetagross Shadow Metagross
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The absolute top DPS option for this raid, beating out even the Mega Evolutions, Shadow Metagross is an oppressive force that can crush Regirock. If you're lucky enough to have a few of this monster raised, then definitely bring it along.

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While a bit glassy, Kartana sports the highest non-Shadow/Mega DPS for this raid. It's a powerful option that that will cause huge damage if put in alongside Mega Sceptile or Mega Venusaur.

Terrakion Terrakion
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The prime representative for the Fighting Type meta, Terrakion has crushingly strong damage and is objectively great for this raid. Just remember that it's also weak to Regirock's Fighting Type moves. 

Shadow Machamp Shadow Machamp
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While not quite on a par with Terrakion, Shadow Machamp shows up with its own advantage by not taking additional damage from Fighting Type moves. In all fairness, the two are largely interchangeable. 

Good Counters

ShadowSwampert Shadow Swampert
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While generally pretty glassy, Shadow Swampert has the advantage of resisting Rock and Electric Type moves in this raid, giving it a strong overall performance.

ShadowSwine Shadow Mamoswine
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While best known for its Ice Type moveset, Shadow Mamoswine actually has a surprisingly solid showing sporting its Ground Type moveset here. And that same Ground typing allows it to double-resist Zap Cannon and lose its Ice Type weakness to Rock Type moves. Just watch out for Fighting Type movesets!

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A solid little guy, Keldeo can definitely put the hurt on Regirock. Just watch out for Zap Cannon!

Shadow Hariyama Shadow Hariyama
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Baby Shadow Machamp.

Metagross Metagross
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Shadow Metagross definitely steals the spotlight for this raid, but the classic variant is definitely worth using as well.

ShadowVenusaur Shadow Venusaur
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A great filler if facing down Fighting Type movesets.

ShadowTorterra Shadow Torterra
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The true vanilla Grass Type, Shadow Tangrowth is a solid option overall.

Shadow-Golurk Shadow Golurk
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Often overlooked, Shadow Golurk is actually one of this game's better Ground Types, and it works well in this raid. It's particular useful against Fighting Type movesets and Zap Cannon thanks to its 2x resistance to both.

ShadowTorterra Shadow Torterra
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While Torterra's Ground sub-typing is generally a hinderance to its average performance, here it's a huge boon as it provides a resistance to Rock Type movesets and a double-resistance to Zap Cannon.

Conkeldurr Conkeldurr
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Poor Conkeldurr was once hyped up as the would-be king of Fighting Types, but it never got its chance to shine. Well, it's good here, at least.

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The classic "true" Water Type, Kyogre only needs to beware of Zap Cannon to do well. 

Xurkitree Xurkitree
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Turns out that having a high enough attack stat and a good coverage move can allow a Pokemon to actually be decent in raids weak to said coverage move. Who knew?

Glass Counters

Shadow Feraligatr Shadow Feraligatr
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Lucario doesn't have the best bulk and is weak to Fighting Type movesets, so on average it won't last super long. However, it also double-resists Rock Type moves, so it situationally has stellar performance.

ShadowGyarados Shadow Gyarados
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A good option if you want to counter Fighting Type movesets, a bad option for any other moveset.

Pheromosa Pheromosa
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Bug hit hard, bug go squish.

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Crabhammer go brrrr....

Tank Counters

Garchomp Garchomp
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While a bit low on DPS, Garchomp resists Rock Type movesets and triple resists Zap Cannon, so it's worth considering if your team's TDO is low.

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A solid TDO option, but generally behind Garchomp.

Raid Graph