Mechakoopa is Bowser Jr.'s Down Special Move. Bowser Jr. releases a Mechakoopa which walks down the stage and eventually explodes.


Bowser Jr. unleashes Mechakoopas from his Clown Car and they travel on the ground in a straight direction, turning around when they reach an edge of a platform. If they hit someone or something they will latch onto the target and damage that before exploding. They will also explode if they are on the stage for too long. The Mechakoopa can hurt Bowser Jr. and can also be thrown by both Bowser Jr. and another player. Mechakoopas can grab onto opponents through shields, making it useful against opponents that are blocking another one of Bowser Jr.'s attacks.

Bowser Jr.'s Special Moves
SSBWU/3DS Ultimate
Standard Special Clown Cannon
Side Special Clown Kart Dash
Up Special Abandon Ship
Down Special Mechakoopa
Final Smash Shadow Mario Paint

Custom Variations

In Super Smash Bros. for Nintendo 3DS and Wii U, Mechakoopa can be customized into Impatient Mechakoopa and Big Mechakoopa.

Impatient Mechakoopa

Impatient Mechakoopa launches the Mechakoopa into the air for a fair distance. It explodes shortly after landing, but is not as powerful.


  • Greater range
  • Can hit opponents that are short-hopping
  • Can be difficult for Bowser Jr. to pick up and throw after dispensing it


  • Deals less damage

The Impatient Mechakoopa custom move has increased range for the Mechakoopa because it actually gets launched a great distance forwards in a low, gradual arc. This wide arc it takes allows it to hit opponents that are short-hopping as either an approach or to set up an attack. Bowser Jr. cannot pick up and throw the Mechakoopa at opponents after dispensing it because it is launched so far away and generally explodes before he could even reach it. The explosion deals less damage, though with good spacing Bowser Jr. could launch the Mechakoopa just over the edge to hit any recovering opponents.

Big Mechakoopa

Big Mechakoopa releases a large, powerful Mechakoopa. It walks past enemies and will only explode if thrown or after a set of time passes. Its explosion is much more powerful.


  • Increased size/hitboxes
  • Easier for Bowser Jr. to pick up due to increased size
  • Deals more damage


  • Slower
  • Decreased range
  • Easier for opponents to pick up due to size increase
  • Explodes earlier

The Big Mechakoopa only damages opponents if they are nearby when the Mechakoopa explodes or if the Mechakoopa is thrown at an opponent, though this damage is increased from the default move. Due to its increased size, it moves very slowly and doesn't go very far before exploding. Its bulky size also makes it easier for opponents to pick it up and throw it at Bowser Jr., though the same is true for Bowser Jr.

Bowser Jr.'s Custom Special Moves
Custom 1 Custom 2
Standard Special Piercing Cannon Air Cannon
Side Special Koopa Drift Grounding Dash
Up Special Meteor Ejection Koopa Meteor
Down Special Impatient Mechakoopa Big Mechakoopa


Mechakoopas are common enemies in the Mario series. They are unkillable clockwork robots who can only be broken apart for a short time before re-forming.