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Japanese pronunciation is アルセウス (A-RU-SE-U-SU). It would rhyme with "Car-Deus". Ar-Seus.
However, the name Arceus is most likely derived from the ancient Greek "ἀρχαῖος", "of the beginning, original, ancient". This would be adopted by alchemists as the term "archeus/archeaus", the primal force that promotes the continuation of life.
Different countries pronounce the Greek differently. Some use a soft c while others use a hard c. You can see similar examples with other Greek words that are pronounced differently by different countries.
Aegis as "Eye-Giss" or "Ee-Jiss"
Cerberus as "Ker-ber-os" or "Sir-bir-us"
Arseus is closer to the original Greek.
