Genki Dama

This is perhaps the most powerful 1-hit attack in existance. You press it once to begin gathering the energy. When it is done gathering energy, a ball of charged energy appears at your hand. Once that is done, you can then press it again to release the genki dama, which is somewhere above your character, and you will have to guide it to its target, much like sokidan. It is somewhat masterable, you can decrease the time it takes to charge it by using it, but even at maximum charge rate, it charges pretty slow compared to other attacks. This move is extremely deadly, so do not use it on someone because it may kill them in a single hit.