I've always pronounced Suicune 'soo-ee-soon', Groudon 'gr-ow-don' (like brown, not row), Kyogre 'kee-oh-gur' (like, ya know, 'ogre') and Arceus 'ar-see-us'. Apparently all of these are wrong?
Not sure if Pidgeot should be pronounced 'pij-ee-ott' or just 'pij-ott' though. I always thought...