finally i finished the game... just can't catch the gem monster... it only appears at cerrtain times and at certain places!

yeah i know how to catch the lil bugger but it's a pain to know where he appears and when! sometimes he's on this platform which I have to exit the current screen to get to. By the time I'm there, he's gone. Reloading the game doesn't guarantee he will appear at the same spot again.