Shishiwakamaru: Attacks
A list of all the attacks used by Shishiwakamaru in the series.

• DARK ITEMS
Shide no Hagoromo: The Cape of No Return
With this floating veil, Shishiwakamaru envelops his opponents and sends them off to another location in the three worlds. Not even Shishiwakamaru can tell where they will go. Luckily for Kuwabara, the cloak didn't send him further than the old arena. There doesn't seem to be any defense against the Cape of No Return, except to avoid it altogether.
This veil is one of the Dark Items (Yami Aitemu) made by Suzuki for his team members.

Tameshi no Ken: The Sword of Trials
Originally, the Tameshi no Ken is a simple hilt. Suzuki explains that it draws on the user's energy to create a blade that will match the user's personality. In Shishiwakamaru's hands, it's a traditional sword blade, until he activates his powers: then it becomes the Makokumeizan Ken.
Shishiwakamaru is a master swordsman, whose speed impresses even Genkai, and he relies on the sword for all of his attacks as he doesn't seem to have any other kinds of physical attacks.

Makokumeizan Ken: The Banshee Shriek Sword
To activate the Makokumeizan Ken, Shishiwakamaru draws the two halves of his sword's hilt apart, revealing a core of melted pink skulls. When exposed to his energy, the weapon is fueled by the spirits of long-dead demons, that Shishiwakamaru can use as projectiles or materialize into barriers. As the name suggests, the Banshee Shriek sword emits screams that can kill those who are not strong enough to resist. According to Shishiwakamaru, "even the famous Benkei preferred to step aside in the face of this sword."

• MAGIC ATTACKS
Shrill Call of the Reaper
When Shishiwakamaru twirls the Makokumeizan Ken above his head, its piercing moans become even more deadly and kill its weakest listeners. Shishiwakamaru calls the horrible sound a "beautiful song" and explains that those too weak to resist it will have their souls stolen.
He uses this technique mainly to demonstrate the powers of his sword, as it doesn't affect his opponents unless they are weak.


Bakutôdokushokusô: Chorus of a Thousand Skulls
When the Banshee Shriek sword hits, the explosion of ki splits open the ground, and howling skulls fly out of the blast and start eating whatever they touch. In the manga, Shishiwakamaru either can't control the heads, or doesn't bother to control them. In the anime, he can choose to direct them in order to concentrate their attack.
The Bakutôdokushokusô takes enormous energy. Even Shishiwakamaru is drained after using this technique.

Onkoshôbakuheki: Cage of Hell
By thrusting the Banshee Shriek sword into the ground, Shishiwakamaru can create a wall of demon souls to trap his opponent. He is able to freely pass through the wall to attack, but his opponent isn't. He uses it to keep his speedier opponents in place while he attacks them with the Banshee Shriek sword.
A more literal translation of this attack is "Binding Shield Wall of Resentful Shouting".

Other techniques: In the anime, during the Makai tournament, Shishiwakamaru fights an enormous demon that almost kills him. The demon swallows him whole, but Shishiwakamaru manages to score a win by reverting to his tiny demon form and releasing enough energy to make his opponent explode.
Sources: YYH Wiki, and the late Shishiwakamaru no Dojo