Palm Attack, called One-Two Punch (ワンツーパンチ/Wan Tsuu Panchi) in Japan, is a move used by King I, King II, Armor King, Armor King II, Roger, Alex and Roger Jr. since the first Tekken game. In the first game's English version, it was called One Two Combo.
The Palm Attack name specifically applies to King II's variation of the move, as the other fighters use their fists and have a different animation. The damage can be increased slightly by using f+1,2. Since Tekken 3, the second hit can be delayed.