Galan007
|Quantum Observer|
Originally posted by JakeTheBank
He did in a filler ep.One theory is that "Super Kaioken" would burn through his body at an exponential rate due to the level of energy required to sustain Kaioken and Super Saiyan. Of course, when Goku used said technique in the filler, he was already dead and him being dead allowed him to later use the Super Saiyan 3 form for a longer duration than he was able to when he was alive.
Personally, I think Super Saiyan + Kaioken is more or less unneeded when Goku can use Super Saiyan 2 or 3 when he needs to.
Super kaio-ken wasn't used in the manga because it's too phucking haxxed.
Just think:
When Goku used that standard/power-doubling super kaio-ken against Pikkon, his power level instantly became equal to that of his SSJ2 form(as a SSJ2 is 2x more powerful than a SSJ1.) So if he were able to use higher kaio-ken multipliers, then he'd attain power FAR beyond what he ever displayed in the manga.
For instance, a SSJ3 is, per canon, 6x more powerful than a SSJ1(as it is 4x more powerful than a SSJ2.) If Goku were to use a x20 kaio-ken as a SSJ1(which is the greatest kaio-ken multiplier he ever used in the manga), then he would become over 3x more powerful than a SSJ3. Just imagine if he were able to use high-multiplier kaio-kens as a SSJ2 or 3... He could have soloed nearly every villain in Z at the same time.