Quick answer — Akihiro Miwa voices Arceus in Pokémon: Arceus and the Jewel of Life, Arechi no Majo in Howl‘s Moving Castle, Moro no Kimi in Princess Mononoke.
Akihiro Miwa voices Arceus (Pokémon: Arceus and the Jewel of Life), Arechi no Majo (Howl‘s Moving Castle), Moro no Kimi (Princess Mononoke).
Arceus is voiced in Japanese by Akihiro Miwa.
