Gohan and Piccolo have one of the best relationships in Dragon Ball, and DBZ & Dragon Ball Super are the proof.

Much like how Gohan achieved Super Saiyan 2 during the Cell Games, the arrival of Cell Max allowed the Z-Fighter to hit his strongest form to date. Even with Piccolo achieving his own ultimate ...

Gohan was already much stronger than Cell when he was at Super Saiyan 2, and the gap now is much wider.