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Cures the user of its major status problem. Fails if the user does not have a status. Cannot cure temporary status effects, such as confusion.
Refresh is a rare move that is kinda useful for dealing with status. It is most often found on Arceus and Latias. It is usually most useful on a last-Pokemon late-game sweeper, where Toxic poison and other status can be the one thing standing in between a loss and a clean sweep. A great example of Refresh at work can be found in this warstory by user shrang.
Aromatherapy is a Grass-type equivalent that removes status from the entire team.
Heal Bell is an equivalent that removes status from the entire team.