How do you turn goku into 4000 kaioken super smash flash 2?

To achieve a 4000 Kaioken Goku in Super Smash Flash 2, you would typically need to modify the game's character attributes through a mod or hack, as such a form isn't part of the standard gameplay mechanics. This usually involves adjusting Goku's stats and abilities in the game's code or using a custom version of the character file. Always ensure you have backups and follow community guidelines when modding games.