Who is the Japanese voice actor for Ann?

The Japanese voice actor for Ann is Yuuna Ogata.

What role does Ann have in that anime?

In Pokemon (2023), Ann is listed as a supporting character.

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Ann is a character in Pokémon Horizons: The Series. She is a student at Indigo Academy and a friend and roommate of Liko. (Source: Bulbapedia)

Pokemon (2023)

Yuuna Ogata

Japanese

Xanthe Huynh

English

Alayin Dubois

French

Zina Laus

German

Luna Fogu

Italian

Ye-na Jang

Korean

Xiaozheng Zhao

Mandarin

Nany Assis

Portuguese (BR)

Alejandra Pilar

Spanish