Bowser Jr. (SSBU)/Down special

Hitbox visualization showing Bowser Jr.'s down special, Mechakoopa.

Hitbox visualization showing Bowser Jr.'s down special, Mechakoopa, when it explodes.

Overview

The Junior Clown Car drops a Mechakoopa from its underside hatch. The Mechakoopa falls in a strong downward arc; once it lands, it starts walking around. If it reaches a wall or dead end, it will turn around and walk in the opposite direction. If it makes contact with an opponent (or travels enough distance in the air without landing), it will detonate. The Mechakoopa will also bite onto opponents on contact that deals 2%, guaranteeing that it will explode on them shortly after that deals 7%. Lastly, if enough time passes and they have not hit an opponent yet, they will spark out and detonate automatically. They can be picked up and thrown as items either by Bowser Jr. or his opponent. If an opponent shields a walking Mechakoopa, it will drop to the ground harmlessly, which can then be picked up.

Hitboxes

ID	Part	Rehit rate	Damage	SD	Angle	Angle type	BK	KS	FKV	Set weight	Radius	Bone	Offset			H×	SDI×	T%	Clang	Rebound	Effect	Type	G	A	Sound	Direct	Hit bits	Hit part	Blockable	Reflectable	Absorbable	Flinchless	No GFX	Heedless
Walking
0	0	0	2.0%	0		Standard	0	100	68		2.7	top	1.5	3.0	0.0	1.0×	1.0×	0%							Kick		All	All
Explosion
0	0	0	7.0%	0		Standard	70	70	0		10.0	top	0.0	3.0	0.0	1.0×	1.0×	0%							Bomb		All	All

Timing

Mechakoopa generated	13
Interruptible	68
Animation length	74

Legend (1 square = 1 frame)

Lag time

Prop event

Interruptible

Bowser Jr.'s moveset

Neutral attack (1 · 2 · inf) · Forward tilt · Up tilt · Down tilt · Dash attack · Forward smash · Up smash · Down smash
Neutral aerial · Forward aerial · Back aerial · Up aerial · Down aerial
Grab · Pummel · Forward throw · Back throw · Up throw · Down throw
Forward roll · Back roll · Spot dodge · Air dodge · Techs
Floor attack (front) · Floor getups (front) · Floor attack (back) · Floor getups (back) · Floor attack (trip) · Floor getups (trip)
Edge attack · Edge getups
Neutral special · Side special · Up special · Down special · Final Smash