They arrived on the spot. It is a big opened area surrounded by a forest. Goku says:

Let's do this!

Goku starts to charge up. The ground is shaking and trembling and then, out of blue, Sonic Rushes in with a Spin Dash while Goku is building up his strength.
He gets hit in the stomach and start yelling out of pain, due to the unexpected nature of the attack.
Amy does the same but misses, turns around midair, summons her hammer and smack Goku off to a tree. Knuckles then clench his fist and yells "DRILL CLAW". His claws are pummeling Goku as he tries to defend himself against this wall of fists.
And then, Goku pushes out a scream, making everyone falls flat on their butts.
Goku turned Super Saiyan.
This is when I turn to Sonic and say:

Hey, Sonic, look at him. I think someone here is copying you.

Yeah…but this time, this is no good. Reply Sonic

Knuckles jumps in the air and as he aim for the ground he yells " HAMMER PUNCH " and falls towards Goku's head but misses, making a small crater on the ground. Goku then turns around swiftly and punt Knuckles face real hard against a tree, breaking the tree. Knuckles is now unconscious.

- KNUCKLES! Yells Sonic…

With all his might, Sonic spin dash towards Goku but he dodges, then he jumps in the air and air dash to his face but Goku blocks the attack. Then both of them starts to exchange hits. Dodging and blocking each others attack as they exchange fists and kicks at the speed of sound. Then Goku was hit right behind his head. It was Amy's hammer, propulsing Goku away from Sonic. Sonic then dashes underneath Goku to kick him in the air just to be caught up by Tails fist.
Goku crashes against the ground, gets up and turns Super Saiyan 2 and says:

Now, let's get serious. Says Goku

Goku jumps in the air, grabs Tails and take him for a spin before he throws him on the ground, knocking him out. Sonic spin jumps towards Goku but is once again Blocked and they start to exchange fists again. And then I join in and as we both attack Goku, we are now all on the ground fighting like crazy. I've never exchanged blows like this and this fast before, it was exhilarating. Then swiftly we both move toward's Goku's side, making an opening for Amy as he knocks Goku in the air. She jumps as high as she can and smack him once more against the ground, Sonic rushes in and use his Foot Sweep attack so he can juggle him a little bit more. But Goku saw through this, grabs Sonic by his foot and throw him against Amy as she was falling back on the ground from the previous attack.
Sonic and Amy are really hurt from that attack but they are still kicking. I dash towards Goku, start to use my training to good use. We both keep on exchanging blows faster and stronger than before. We were fighting so damn hard that the heat and wind of our attacked could be felt. Sonic and Amy yells at me, encouraging me to keep on going as they both dash towards us so they can join in and get him good. But Goku instant transmission behind Sonic and Amy and kick them both behind the head. Amy manage to block the attack with her hammer, giving me the opportunity to jump in and attack Goku. Sonic spin dash towards him and tries to hit him in the face but misses as he instant transmission'd away from us and start throwing energy blasts.

Explosions are coming from everywhere as we keep on trying to dodge. His attacks are so strong and fast that we can't get near him at all. But Sonic had an idea. He start running very fast and then yells " BLUE TORNADO!".
Goku tries really hard to resist begin dragged by the tornado but can't he is sucked in up towards the air while sonic rides the tonardo and hits him several time before the attack ends.
Goku and Sonic falls on ground. Amy and I rushes towards Sonic to see if he is alright.
Goku gets up and starts powering up, but we are not letting him do that. Amy helps sonic to get up while I rush towards him but I get knocked down to my knees by a big wave of energy being blasted out of Gokul.
Goku just turned into Super Saiyan Blue.
His power seemed to be so intimidating and big. The strongest we've ever seen and then he start screaming: "KA!...ME!...HA….ME…!"
Instant transmission behind us and knock us out really bad as he yells out the last part of his attack: "HAAAAAAAAAAAAAAAAAAAAAAA!"

His attack was so strong that we all went out cold, unconscious, while tons of trees gets blasted away before this powerful blast.
Goku turns back to his regular form and sigh.

- Wow! That was fun. Better bring you guys to Bulma's so she can heal you up good. Maybe we can help you guys out with your little problem. Hehehe!