So, what's the Super Kaio-ken?
It's a transformations Goku uses when he fights against Pikkon, in the Other World Tournament: while he uses this form, we can see him with the crimson aura that the Kaio-ken has, but he has his hairstyle changed, like the one of a Super Saiyan.
Here you can find more informations about this technique:
So, basically this just gives an enormous power, and I thought it could be a thing in DBOG, or something like that.
Let me explain: the SSJ gives a certain amount of stats and so does the Kaio-ken. What about combining them both in order to make this transformations possible? Obviously, it shouldn't be the overpowered like it should combine the stats but not really make them stronger, just by a tiny bit.
After using the transformation, in twenty seconds, fifteen maybe, you go back to normal, because it shouldn't be too strong, as I said.
Another thing I think about this is to give this skill, if it should ever be implemented, a long cooldown in order to not use it too much, like 1 hour or something like that. Another debuff I'd personally add would be the fact that after you go back to normal, you get your EP down to 0 or something like that.
Hope this is a good suggestion for you all.