Who is the Japanese voice actor for Underground Man?

The Japanese voice actor for Underground Man is Unshou Ishizuka.

Which anime is Underground Man from?

Underground Man appears in Pokemon Diamond & Pearl.

In Pokemon Diamond & Pearl, Underground Man is listed as a supporting character.

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The Underground Man lives in Eterna City in a house next door to the Pokémon Center. (Source: Bulbapedia)

Pokemon Diamond & Pearl

Pocket Monsters Special

Unshou Ishizuka

Japanese

Eric Schussler

English

Pierre Lognay

French

Fábio Villalonga

Portuguese (BR)

Enrique Cervantes

Spanish