Shirona

Shirona is astoundingly powerful and well-respected as Sinnoh's Champion. She is measured in her battling style, and while she attacks in quick succession, she prefers not to exhaust either hers or her opponents' Pokémon. Shirona has a calm demeanor, not showing the slightest of stress even in the heat of battle. Shirona is incredibly wise and well versed in the Sinnoh time-space legends. She often quoted "When every life meets another life, something will be born", a line directly from the Sinnoh time-space legends. She is particularly interested in the friendship between Trainers and their Pokémon, and enjoys mentoring young Trainers, and willingly offers advice to support their growth such as Satoshi, Shinji and Unova League's Cattleya.

(Source: Bulbapedia)