Full Power Suepr Kamehameha was a Techniques invented by Gohan while he was training with Goku. He invented this technique after he killed Cell because he thought that if Cell somehow reformed he would be stronger then ever. He only used this technique while training with Goten. Goten deflected it but it took away almost all his power. Goten learned this technique soon after Gohan used it. he used this technque while training with Goku to. This attack resembles to a normal Suepr Kamehameha, but is 5x's stronger then a Super Kamehameha.