Suiren

Suiren is a student at the Pokémon School on Melemele Island and one of Satoshi's former classmates. She lives with her mother, father, and younger twin sisters Hō and Sui.

Suiren is a calm and gentle girl who cares deeply for Pokémon, particularly Water-types. As such, she enjoys many seafaring activities, such as fishing. Her love for Pokémon runs deep to the point where she grows incensed at the sight of cruelty against Pokémon. She is highly protective of her Pokémon. When she isn't concerned for the well-being of Pokémon, she takes many measures to keep them happy. She is an expert at fishing.

While sincere most of the time, she also has a playful side, oftentimes telling outrageous jokes. She has a tendency to inadvertently tell the truth when she makes things up.

(Source: Bulbapedia)