The legendary Pokémon in Pokémon Go are some of the most sought after prisoners in the game. They turn quite often, so you have to be on your heels to catch them. Regice appears every few months, which makes it one of the most common options. Despite being more common than many others, it is still quite powerful and a useful addition to your Pokémon team. You can expect it to be used often by other players in the Grand and Ultra Leagues, though probably not as much as Regirock or Registeel.
Regice is an ice-type Pokémon. It is weak for Fighting, Fire, Rock and Steel movements, but is resistant to Ice attacks. Because it is only resistant to Ice-type movements, you must be very careful when using it. Regice makes it pretty easy to find a Pokémon on your list that you want to abuse. When using Regice in the Grand or Ultra League, you would usually want to have them as the last Pokémon on your team to withstand enemy attacks. But being weak on so many types with so little resistance is problematic and risky.
Of the two leagues, you want to use Regice in the Ultra League. Against Pokémon in this category, it has a much greater use than in the Grand League. Regirock and Registeel dominate the Grand League. You can use Regice in the Grand League, no problem, it will be decent and you can become a good member of the party. The Ultra League is a place where it really shines, where it can make much more use of its defense statistics. The same goes for Regirock, but Regirock’s already reliable size and health make him just as good, if not better, in the Grand League.
The motion set you want to give the Regica when used in PvP is a fast motion lock and charged with blizzard and earthquake strokes. Blizzard has good uses in these battles because it is able to close flying types. The earthquake is another good move that should protect Regice from types of fire, rock and steel. Regice will always fight the types of fights, regardless of the attack they learn. You will want to make sure you have a partner or Switch Pokémon on your list who can step in and eliminate all types of battles that appear.
Overall, Regice is a good choice, especially in PvP. It competes with Regirock and Registeel as a good choice that you can use as your last Pokémon thanks to its strong defensive status. It can withstand most battles without the need for a shield, but if you’re worried about being used by a combat type, especially in the Grand League, having a shield at hand is not a bad idea.