Mikachiri - Cath
Mikachirikushikitoku - Catherine
Aririkizudoku - Shijue
I have no idea how you can pronounce 'Catherine' in Jap, but it's definitely gonna sound a little weird, so if you are giving it a shot, please figure that out in your brain :P
On a side note, I think Mikachi sounds like Pikachu for some reason!