Episode 207, "Take Flight Videl", while at 150x gravity and vegeta punches him in the face. Hahahaa
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Episode 230 "Super Saiyan 3"
Gohan is the strongest saiyan on dragon ball. Not super saiyan but normal form saiyan. Only not best super saiyan because he can't go super saiyan 4.
Actually Gohan goes super saiyan 2 in the episode The Unleashing.
episode 35
160 is when he first went super saiyan 2 after training with goku (his dad) as a super saiyan 1 he was angry because cell killed so many people and killed one right in front of him so he got angry and went SUPER SAIYAN 2. P.S super saiyan 2 is the highest super saiyan gohan can do but in dragon ball AF gohan goes super saiyan 4 and goku goes super saiyan 50 that is all i can tell you.