In Naruto to Boruto Shinobi Striker you can equip your character with new ninjutsu and secret techniques at the Inn.
Unlock New Abilities: To do this you need to level up your masters in the Ninjutsu Library. Go to Sasuke in the marketplace and talk to him, you’ll meet him after the first tutorials. He will let you enter the Ninjutsu Library.
Choose someone as your master who has the attacks you want. If you are healing, you should choose a healer like Sakura. If you prefer to play ranged combat, choose someone with ranged abilities like Sasuke. You can display the respective unlocks by pressing the triangle (in the Ninjutsu library).
Now you have to level up your master. This is done by collecting XP, mainly through fast matches and Ninja World League (PVP). A quick match win gives your master 200XP and a defeat takes you 100XP.
The new Ninjutsu attacks from your Master will not be unlocked immediately. You have to go back to the library to unlock the new moves.
Have you seen all PS4 trophies / achievements for the game? Here we have a complete trophies guide.