Gohan's Ultimate is a versitile counter move. If he's hit during his special pose, Gohan counters the opponent
and destroys him with an explosive beatdown. However the attack can also be comboed into at the cost of slightly lower damage.
Also, in Unleashed mode, Gohan gains access to different finishers,
which are performed automatically depending on the Unleashed Bar level;
Lv1 - Hi-Ex Blast Fist.
Lv2 - Demon Tribe Beatdown.
Lv3 - Flash Kamehameha.
The Flash Kamehameha plays after performing the combo-version of the Gekiretsu Ranbu. However, if you're at Level 3 of the Unleashed Bar and manage to land the raw counter against the enemy, a wholly different cinematic plays out, so definitely give that a try!