G-Max Hydrosnipe inflicts damage, ignoring all ignorable Abilities during the execution of that move. (Ignorable Abilities are most Abilities that could potentially negatively affect the success, damage, or effects of a move if possessed by the target of a move or its allies—such as Multiscale and Friend Guard.)
Whether it is a special or physical move depends on the move it is based on. Unlike most other G-Max Moves, its power is 160 regardless of the base move.