Regice Pronunciation

I always pronounce Regice like Reg-ee-Ice, but everyone always says I'm wrong and says it's just Reg-Ice with one I. If thats true than how about Glameow being naturally pronounced Glam-Meow and not Glam-eow with one M not 2. Also what about Roserade being pronounced Rose-er-rade with 2 Es and 2 Rs rather than being pronounced Rose-Rade with 1 E and 1 R?