Kaiō-ken

Kaiō-ken (界王拳, Fist of the World King) is Goku's down special move in Super Smash Flash 2. To archieve the Kaiō-ken, Goku must charge his power for about 5 seconds without moving, any opponent that touches Goku while powering up, will receive few damage. When a Kaiō-ken is succesfully performed, Goku will tint himself with a red-pink tone and it will power up his current moveset, making him stronger, faster and more deadly, but not as powerful as Super Saiyan Goku. This transformation, however, has its costs, as Goku starts taking 5% of damage per second (so by 10 seconds of playing as him you'll have +50%), more unfortunately, Goku doesn't gain any kind of knockback resistance. He gains a new side special move and a second teleportation on top of his up special move. His standard special move is toned down a bit but he becomes faster in everything else. To return to his former self, simply the down special move should be used again to remove Kaiō-ken completely.