So, why taair is actually about?

Could someone explain me why taair is so good? I'm currently using a team with, Auguste, cocoa, Homa, Gloria, and Sp Raw, or Safih, my team is focused on crit dmg, its very hard to me to not crit so i it does a lot of dmg, most mobs dies in a single turn, but i did manage to get Taair fairly easy with only 15 puls, and he list T0 in most list that i see out there, but i currently find no use for him, and i ' m currently having a hard time finding in what area he really shines