Allergic is a status ailment that appears in Paper Mario: The Thousand-Year Door.
Allergic is a rather special status ailment. When Mario or his partners is Allergic, they will not be able to receive any other status effects. This means if someone is Allergic, they won't be able to get stat changes in attack, defense, etc. This means they cannot use items such as Power Punch to raise attack, Courage Shells, to raise defense, or even the special move Power Lift that raises both. The only ways to get the Allergic ailment is to either eat Space Food to get hit by the Shadow Queen's breath attack. Allergic will go away over time or when the battle is over.