Chisato

Sonrisa is a character of the day who appeared in Grin to Win!. She lives in Bloomingvale in Johto and raises Sunflora to compete in the Sunflora Festival.

Sonrisa's Sunflora sleep happily in her greenhouse, and a homemade irrigation system keeps them watered and happy. Unlike other Trainers, who used various odd methods of Pokémon raising such as trips to tanning salons or hiring performers to keep them entertained, Sonrisa simply provided her Pokémon with fresh air, water, and sunshine.

She is a kindhearted, easygoing individual who is well-liked in the Bloomingvale community. Sonrisa stumbled across Ash and his friends outside Bloomingvale, and gladly offered them a drink from one of her irrigation pipes before inviting them over to her home. Sonrisa often laughed at Brock's flirtatious comments, not taking them too seriously. She was grateful for Ash and his friends' support, and credited them for helping her win the Sunflora of the Year award.

(Source: Bulbapedia)