he thought he was strong enough with out it and he was being some kind of show off
You can't. The game only features Gohan as a base-level Saiyan, not as Super-Saiyan.
teen gohan would win because adult gohan had to go to high school and he hasent trained in a while
gohan while he was super saiyan 2
One of episodes in the cell battles of dragonball z kai while fighting cell
Gohan first turned ssj2 while fighting Goku in the hyper bolic time chamber while training for an instant while exhausted from training for 20 hours then he transformed into it again when cell killed android 16
Gohan turns super saiyan in episode 145 while training with his father Goku in the hyperbolic time chamber. Goku was blasting Gohan with a Kamehameha wave and while Gohan was blocking it he transformed into a super saiyan! To add to this, Gohan thinks/remembers all the times when he let his friends down, then while blocking the attack he starts to get upset/angry with himself for letting them down, then he turns super sayan for the first time, but he can calm down so Goku tells him what to do then he is in normal form again and on his knees because he is tired from transforming. I hope it helped.
Yes, he can. Trunks demonstrates the ability with Gohan while they both battle Broly in the movie, Broly: The Legendary Super Saiyan.
It kinda looks like it, because if you have seen Goku or Vegeta, or even Gohan at ssj2, they have an aura, and electricity around them. In the episode Fusion Dance, Goten and Trunks at there full power look like that. So I would say yes! == ==
gohan is stronger than trunk gohan can go super saiyan 2 and trunk too but gohan is stronger EDIT:trunks is stronger because trunks beat frieza and king cold no sweat while gohan counldnt put a scratch on frieza
While training to fight Cell, Goku and Gohan went into the Hyperbolic Time Chamber (Room of Spirit and Time in Japanese) to train. 1 year of training in the chamber equaled 1 day on earth. During that time Gohan learned to go Super Saiyan.
Hate to break it everyone, but Goku consecutively proves he is stronger than Gohan. I will admit, Gohan has had his moments when he became SSJ 2 against Cell. But that was only until Goku learned SSJ 2. He surpassed SSJ 3 Goku for an episode or two, but Goku SSJ 3 still held his own against Super Buu {Ultimate Gohan, SSJ 3 Gotenks, Picollo absorbed} for a short while. Even in Super, the furthest he could handle was SSJB/SSGSS (Super Saiyan Blue/ Super Saiyan God Super Saiyan) and he was only on-par by then. But Goku easily handled Gohan when he used Kaioken {Note: Even using a X1 (2 fold multiplier) Goku SSJB/SSGSS could easily defeat Ultimate/Mystic Gohan.} And Goku also has Ultra Instinct. So your answer, Gohan is weaker.
It is impossible to be "stuck" in Super Saiyan because it's a power up, you can only power down and not have the energy to power up. What you might be referring to is Ascended Super Saiyan, a form in which Goku and Gohan stay Super Saiyan in order to build up their synchronization with the power up's abilities and using their normal powers while powered down.