Super Jump Punch

The Super Jump Punch is a third jump that Mario and Luigi can perform in all three titles. Dr. Mario also shares this move with them in Melee. It is executed by pressing B while holding the control stick upwards; thus, it is their up B attack. When performed by either of the "Marios," they jump up diagonally with more vertical range than horizontal; if the attack strikes an enemy during the jump, coins fly out of the enemy, and the foe receives multiple hits for up to about 12% damage. The last hit of the attack deals a little knockback, but it can Star KO opponents if used near the upper blast line (especially in Brawl). This move is occasionally referred to as "Pay-Day Punch" which was what Nintendo Power magazine named the move in its review for Super Smash Bros.

Dr. Mario
When Dr. Mario performs the attack, coins fly out of the enemy, and the foe receives about 12% damage. Dr. Mario's version of the attack is the exact same as Mario's, but it's more powerful. Also, the sound effect is different than the usual sound made when Mario grabs a coin.

Luigi
Luigi's Super Jump Punch only deals 1 point of damage, and only makes a character flinch very slightly. However, if the attack's sweet spot hits a character, it becomes a powerful Fire Jump Punch which deals around 25% damage with high knockback. Luigi can turn around after the initial hitbox, however, its usefulness is questionable. In Super Smash Bros. Melee, Luigi's attack sends him vertically without any horizontal range, forcing him to rely on his Green Missile for recovery. In Brawl, Luigi turns upside down at the peak of his jump, falling on his head. This allows for more horizontal movement after the move but has more landing lag compared to his Melee Super Jump Punch. The Fire Jump Punch if used in the air is slightly weaker(20% rather then 25%) than if used on the ground (in all three Super Smash Bros. games). It is possible to combo with it by small jumping, performing an n-air, and then using a sweetspotted punch at percentages around 40% with many characters. The Fire Jump Punch is often nicknamed Shoryuken due to its resemblance to the Shoryukeun attack from the Street Fighter games.

Special usage
Additionally, Dr. Mario (in Melee) and Mario (in all three Smash games) can "aim" their Super Jump Punch straight up vertically by holding the control stick in the opposite direction they are facing during the "spark" of the Super Jump Punch's animation. On a side note, in relevance to the technique and appearance of the attack, some people also call this move the Pay-Day Punch.

Origin
In the original Super Mario Bros. Mario and Luigi could hit blocks from below. Some of the blocks had coins they would release. This is where the coins that are released when this move is performed with the Mario Bros. Also, in the original Super Mario Bros., both Mario and Luigi hit the blocks with their fist. This is the reason they punch like that when they are performing the move. It is also identical to the "Rising Break" technique performed by Fighter Kirby and Knuckle Joe in Kirby Super Star, sans the coins.

Coins
Coins are the currency of the Mushroom Kingdom in the Mario series. In the Super Smash Bros. series, beginning with Super Smash Bros., they are created when the Jump Punch connects with an opponent. The appearance of these coins is modeled after the coins from Super Mario 64.

In Melee, their appearance is the same as the original, but the coins for the Trophy Lottery look similar. Also these same coins are used on the Game Over screen in adventure or classic to continue. In Brawl, there is a coin sticker in Super Smash Bros. Brawl. Also, coins are used in the Coin Launcher game and as in melee, the game over screen.

Video (Mario)
wSYBG_1gmFE