An expert trainer is someone who knows all the ropes to Basic Battle as well is skilled in Elemental Battle. They should know how to tally their Elemental Adjustments and make sure how to adjust stats during battle.
They should be battling regularly as well as be courteous to other members.
Expert Members are those who have exhausted all the other sections, such as the Basic and Advanced sections and are looking for more things to do.
The next few sections are built for these Trainers who want to become more powerful in the world of the Naisuk.