Needed to figure almost foolproof method for this to avoid controller damage.
Buy Vilgax from the Store and use him. Easy difficulty.
Go to level select -> Dexter's Lab -> Stage 3
Pick Vilgax, Jack, Whatever, Whatever.
Now, jump and dodge Aku's attacks taking as minor health damage as possible, use the standing attack laser beam holding X. Takes around 5 hits to clear the first section.
In this game the characters seem more vulnerable to the attacks when they have taken enough health damage, sending them to the air and to their deaths easier.
Now, in the final section, dodge the fire bombs and double jump and throw the red bomb to Aku. Then hold X and shoot the laser when he collapses. KEEP facing Aku, now he uses the wind attack, but you should barely move anywhere, because you have so much strenght (health) left. As long as you keep this position and have enough health, you barely need to move to defeat Aku without dying. Hit the button when you get the chance and he dies.