Goku is being charged with everything you can possibly imagine Goku being charged with. The lead prosecutor is Jack McCoy, and he is operating with no oversight on his actions and has access to any evidence that, lets say would be within Bulma's ability to obtain. The Judge is the judge from Ace Attorney. No one is allowed to use violence. You pick a lawyer to defend Goku. They must be a lawyer or some kind of legal advocate, and they may not use any kind of direct esoteric influence on the results of the trial: So they can read a witness' mind, but they can't mind control the witness. All called witnesses must appear, and must answer any question put to them (though not necessarily truthfully). In addition to just defending Goku in court, the lawyer or their team must be able to:

1. Get Goku to court, in a suit, and get him to mostly behave.

2. At some point, get Mr. Satan to admit that he is a fraud

3. Still win the case after Goku finds out, on the second last day of the trial, that the prison he'll be sent to is full of exceptionally strong fighters who all use techniques completely different from anything he's ever heard of.

Pick a lawyer.