Overview
The Regi trio have emerged from their sealed chamber, and they aim to leave our spirits crushed and potions depleted. All 3 legendary titans are bulky with no double weaknesses to exploit, so unprepared groups may be surprised when they fail to beat the clock. Regardless, small groups are the best way to maximize rewards against the Legendary Ice Titan. The biggest threat here has to be Regice's coverage moves, which have wide coverage and severely threaten a number of its major counters, so care should definitely be given when standing against this permafrost behemoth.
Team composition
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The top Mega Evolutions are Mega Charizard Y and Mega Blaziken. Each has their own unique benefits for this raid.
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The top general-counter is Shadow Metagross.
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Clear, Cloudy, and Snowy weathers favor Fire, Fighting, and Steel Types respectively. Be prepared to change up your team based on the whims of nature.
Battling strategy
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Under normal circumstances, a 3-trainer run is the bare minimum needed for Registeel. A duo is possible given beneficial weather and Mega Boosts.
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For these cases, a tried-and-true strategy is to bring in Mega Charizard Y or Mega Blaziken (it depends on Regice's moveset) as the lone member of your team while a partner does the same and revive/re-enter ASAP when inevitably KOed. This strategy is resource-intensive, but can provide huge DPS benefits.
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Re-entering is necessary; standard lineups shouldn’t need >1 re-entry
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Dodging is mostly unnecessary but may help. Just make sure you don't do it so often that you eat into your DPS.
Mega Blaziken
Fast Move | Charge Move | Rating |
One of the top Mega Evolutions in the game objectively speaking, Mega Blaziken was guaranteed to show up for this raid, and show up it does. As the top DPS counter for this raid, it's going to be the first pick of many trainers. And why shouldn't it be? It hits like a truck, it's got solid TDO, and it sports a resistance to Regice's deadly Ice Type movesets.
Well, our good friend Mega Blaziken has some competition, because it also has a few issues for this raid. Namely, it's weak to Earthquake and takes neutral damage from Focus Blast, both of which can severely hinder its TDO when compared to its one true bit of competition in this raid. When taken together, this means that Mega Blaziken is definitely one of the best counters to Registeel, but it also means that it's not the absolute dominant Mega Evolution counter on this list.
Also worth mentioning; running Counter/Blast Burn is superior to Fire Spin/Blast Burn, but the latter is still perfectly fine.
Mega Charizard Y
Fast Move | Charge Move | Rating |
Reigning from on-high, Mega Charizard Y is the usurper to Mega Blaziken's throne. With an offensive presence similar to the master of all chickens, this flying dino of fire generally faces one main issue when faced with its competition; the fact that its Flying Type generally gets in the way. However, that is not the case this time. While Mega Charizard Y's Flying sub-type does mean that it loses its Ice Type resistance, it also grants it an outright resistance to Earthquake, while it also takes neutral damage from Focus Blast and Rock Smash. While this is a bit of a trade-off, it's a trade-off that's beneficial in about 2/3 of Mega Charizard Y's matchups, meaning it rivals Mega Blaziken for this raid, and may arguably be the better pick in reality.
Terrakion
Fast Move | Charge Move | Rating |
Remember when Terrakion wasn't a Fighting Type wrecking ball? Terrakion remembers, and it wants to make up for lost time.
Much like Mega Lopunny, this is a Fighting Type that's weak to Fighting Type moves, so keep vigilant for this fight. Get around this small weakness, and you've got yourself a genuine winner of a counter, ready to reduce Regice to a pile of crushed ice.