Special Attack (Mario & Sonic at the Olympic Games)
From the Super Mario Wiki
Special Attacks are moves in the Dream Events of Mario & Sonic at the Olympic Games. They appear in two events on the Wii: Dream Fencing and Dream Table Tennis. Players can use them by pressing A+B at the same time while doing the Lunge/Hit. The attack varies with each character. They are very helpful and can be used to get an advantage over the opponent. Whilst playing the two events, there is a bar at the bottom which fills with energy every hit. When the bar is filled, the players can use a special attack and will start again to reach a new attack. The max amount of attacks they can have at one time is 3.