Charging Ultra Boo Boo Volleyball
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Gotenks fires multiple Cosmic Halos that trap the opponent in a volleyball-like object. Then, he grabs the volleyball and hits it over to Piccolo who then hits it up into the air. Finally, Gotenks flies up into the air and performs a Spiking Boo Ball Slam by spiking the volleyball down to the ground, creating a massive crater and inflicting a huge amount of damage.
Dragon Ball Z
Gotenks used this attack during his battle against Super Boo. Super Boo destroyed Kami's Lookout trying to hit Gotenks and Piccolo with the Mystic Ball Attack. Gotenks managed to catch Super Boo with the Charging Ultra Boo Boo Volleyball and spiked him down to the ground with the help of a reluctant Piccolo.
This attack appears in the Budokai Tenkaichi video game series as Gotenks's Ultimate Blast in his Super Saiyan 3 form. In Dragon Ball Z: Budokai Tenkaichi and Dragon Ball Z: Budokai Tenkaichi 2, Gotenks does this technique alone. This is fixed in Dragon Ball Z: Budokai Tenkaichi 3 where Piccolo assists him as in the anime.