Only read this if you want to get spoiled or you want to unlock the achievement.

IMPORTANT
Before you enter the train it is important that you keep your pogs and that you have the E-cell batteries. You will end up using them later in the guide.

To obtain these items one must collect the batteries from the TV remote in act 1 (you must have a ported save) and keep your pogs before getting onto the train (you must not trade them to Elwurd and instead get train tickets from Chixie and Zebruh)

Coincidentally you can also unlock 'Evil', 'A Fire Mixtape', 'Next Time Maybe', 'Tough Love', 'Ultimate Collab', 'Star Power' and 'Sylladex Spring Cleaning' through this achievement path.

Before you start the trial by talking to Tyzias and selecting the option to do so you must collect as much information as possible. This is hard to mess up as Tyzias will prevent you from going in without the bear minimum but you must talk to Zagora and complete his trading quest first.

Tagora's trading quest is started after you obtain the footage from the security grub above the load gaper. The quest automatically progresses itself if you continue to talk to Tagora for more evidence as he will take your spices, your pogs and then your batteries.
The quest gives you Tegiri's browsing history and Tyzias' notes.

When you know you've done it correctly Tyzias will say "color mmmme immmmpressed" and you can safely start the trial.

Allow for the trial to continue past to the recess normally, if you don't know what to do just ask Tyzias, she gives you the answers for free.

When the recess is called you must talk to Tyzias and bring up that she knows what's really going on, this will allow you to present two pieces of evidence and a suspect.

Present both the nail polish and Lynera's diary and then Wanshi as the suspect. This should start the trial again immediately after Joey talks.

If you've followed all the steps correctly then Wanshi should admit to falsifying evidence which prevents the trial from going any further.
This leads to Marvus calling a mistrial and clown court being adjourned.