Who is the Japanese voice actor for Hiroto?

The Japanese voice actor for Hiroto is Ikue Ootani.

What role does Hiroto have in that anime?

In Pokemon, Hiroto is listed as a supporting character.

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Zachary Evans is a character of the day who appeared in Wings 'N' Things. He also appeared in Ash & Pikachu. (Source: Bulbapedia)

Pokemon

Satoshi to Pikachu

Ikue Ootani

Japanese

Amy Birnbaum

English

Guylaine Gibert

French

Federica Valenti

Italian

Francisco Freitas

Portuguese (BR)

Patricia Acevedo

Spanish

Sara Vivas

Spanish