POW-Up

ATK-Up is a positive status condition that has appeared in several Mario RPGs. It stands for "Attack-Up".

Mario & Luigi: Superstar Saga
Red Peppers boost attack power in this game, giving more power to Mario and Luigi's attacks. The status is indicated by a red burst with an arrow pointing up next to the Mario brother's HP.

Mario & Luigi: Partners in Time
Red Peppers appear again in this game, although they affect both fighters currently active. ATK-Up is indicated by an expanding red circle around the attacker. Certain enemies can also raise their own attack power by becoming enraged (usually due to low HP).

Mario & Luigi: Bowser's Inside Story
ATK-Up was renamed POW-Up in this game, but serves the same purpose. Red streaks flowing upward indicate the affected.

Paper Mario: The Thousand-Year Door
In this game, several items and the Crystal Star power called Power Lift can raise attack power. The ATK-Up status is indicated by an angry face above Mario or his partner. Enemies can have this status effect, also, by taking up a turn to charge.