TC, you're spot on in pronunciation. The poke'mon is a combination of cell mitosis (but in reverse I guess? Maybe it's a nod to mitochondria migrating and forming a symbiotic relationship with it's formerly host cell.) and Homonculus, or Plato's cave, the Cartesian Theatre, basically the mind is within the mind, separate from the brain (dualism). I think it's a really interesting idea as far as the biology part is concerned, dualism isn't so interesting.
It wouldn't be pronounced Ree-noo-klee-us because the "u" comes before the "n" in Re-u-ni-clus (Reunite + Nucleus or Homonculus/whatever)