In nicetia all official battles are held in what is called "imaginary space." imaginary space is essentially augmented reality and it allows trainers to use certain trainer skills when in battle. A trainer may only use one trainer skill per battle and they must set that trainer skill before entering the battle. Some trainer skills can do things like raise stats while others protect a Pokémon from damage that turn. I will explain what a trainer skill does when it is given to the player so don't worry too much about it.