Beat Piccolo and Gohan in Dragon Ball Z Kakarot
In addition to fighting against these two characters, the game challenges you by not maximizing Goku's health and neither will be healed.
This means that if you are harmed, your health will not be recovered, so make sure you have it recovered manually.
In research, eating food will not heal you, so you need to find an alternative. West City stores sell Vitadrink which will maximize Goku's HP. Don't go into battle without doing it.
When you have entered the boss battle with Piccolo and Gohan, you don't have to fight both together.
In fact, the best advice we can give you is to focus on just one, no matter who he is, and after he is defeated you should go and fight the other character. Although while you are fighting the first character, others may attack you as well.
For example, while you're fighting Piccolo, Gohan will also attack you with Ki Balls' occasional linear beam attacks, but the damage from these attacks is nowhere near, so why should you fully focus on Piccolo while fighting him and not get distracted .
The reason I'm asking you to take out Piccolo first is because his melee moves are a little stronger than Gohan's and give you more damage. If you defeat him first, you'll have more HP and time to take down Gohan later.
The transformation (L2 + R2) will increase the damage but also eliminate your Ki. Also, keep close to the character you are fighting and don't increase the distance between you and him.
Skills and Piccolo tokens
Explosive Wave: The wave will charge you and then detonate explosive energy around Piccolo. You should withdraw from him or defend yourself.
Demon Flash Strike: A red arrow appears in this attack which is followed by Piccolo's lunge attack. To avoid this attack you should avoid line attacks or just defend yourself.
Special Beam Cannon: This is a charged line attack. Just avoid getting hit with it.
Gohan's skills and markers
Masenko: A charged beam attack. Just avoid getting hit with it.
Body Impact: Gohan starts moving before hitting you with a surprising blow. Avoid getting hit with it when Gohan reappears for the punch.
Turbo Slash: A hurricane attack. Walk away as Gohan comes to your side