Yo-yo glitch

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Ness taunting alongside the disconnected yoyo hitbox, seen in red.

The yoyo glitch refers to a glitch done using Ness's yoyo. It can be used to attack or grab with near limitless range or attach certain single-hitbox attacks to Ness's body. The discovery of the glitch was a collaborative effort between VilNess, LonelyNess, and Dan Smith, and was spurred on by an innocuous video of an unknown Japanese player accidentally dropping a yoyo hitbox.

In Melee, the glitch can be performed in all versions of the game.

Mechanics

Ness's up smash consists of 3 parts each with its own hitbox: outreaching, spinning, and swinging. The yoyo glitch drops the last hitbox of the up smash onto the ground and leaves it there until Ness gets KOed or uses a non-projectile attack.

How to perform it

Use Ness's up smash and hit any opponent or destructible part of the stage with the outreaching part of the yoyo. Charge the yoyo very slightly before releasing.
Make sure that, after the yoyo is released into its upward swing, it doesn't hit anything else.

Jackets

After using the yoyo glitch, certain other attacks can be used to replace the yoyo hitbox with the hitbox of the attack used. The rules of the regular yoyo glitch still apply when using a jacket.

PK Thunder - must either be used to hit Ness into the ground or at a ledge to grab it.
Down aerial
Up aerial
Down smash

If any non-projectile attack other than the ones listed is used to hit all targets between Ness and the location this glitch was performed, the jacket will be transferred to the opponent, allowing for near-limitless range.

Super Yoyo Glitch

It is a very rare occurrence, so very little about it is known. Its effects (including but not limited to infinite Jackets and instant KO throws) are similar to those of the Yoyo Glitch, but are more lethal and have longer lasting effects.

This technique holds much value to Ness players and is said to be the secret to beating the Bowser Challenge.

Gallery

Ness performs the first step, creating a trap with a dropped hitbox.
If the enemy is in between Ness and the dropped hitbox, all of his standard attacks, smash attacks, grabs, and PK Thunder 2 will hit the opponent.
Not only can you grab the enemy, but smash attacks work too.
Using the deadline to smash from long range, with hitboxes visible.
Deadline even works with PK Thunder 2, the attack that occurs when Ness hits himself with pk thunder.
Ness runs into Samus while wearing a Thunder Jacket
The glitch is viable for tournament use: here, Mofo performs the glitch and grabs Hax (Captain Falcon) from long range.
In the same match, Mofo installs a Thunder Jacket. He is hit by Hax, who is KO'd by the jacket. Mofo is hit by the tail of his PK Thunder and survives.
Toasty turns the hitbox into a down aerial hitbox, and then charges his PK Flash. The down air hitbox pops Link into the air, where he is hit by the PK Flash.