Who is the Japanese voice actor for Eriko?

The Japanese voice actor for Eriko is Yumi Touma.

What role does Eriko have in that anime?

In Pokemon, Eriko is listed as a supporting character.

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Pietra is a character of the day who appeared in Right On, Rhydon! (EP206). She also appeared in Ash & Pikachu. (Source: Bulbapedia)

Pokemon

Satoshi to Pikachu

Yumi Touma

Japanese

Carol Jacobanis

English

Julie Basecqz

French

Anke Kortemeier

German

Patrizia Mottola

Italian

Fernanda Bullara

Portuguese (BR)

Cony Madera

Spanish