Maximus will clear a diagonal line of Tsum Tsum. His base number required is 19. Higher skill levels will reduce the number required to fill in the skill meter.
Maximus' skill is to clear a diagonal line of Tsum Tsum with a sword going from the bottom left to the top right diagonally, so turn on gyro mode and tilt your screen so that more Tsum Tsum can be cleared.
Skill Level Edit
|Needed (Tsum Tsum)||Skill