Hmmm, intriguing start. The old man moves as the knight does on a chessboard. It will be interesting to see who he is, or was, if he's dead. The length is fine for a prologue; I'm assuming your chapters will be longer. My only criticism at this point is to watch your modifiers. Your final paragraph seemed indecisive because of phrases such as "kind of" and "apparently". The only sentence that should have contained any doubt was:
It might have been seen as if it entered, though truly, it was still floating around near the other world, not yet in.
The other modifiers only serve to weaken your descriptions. Sorry if I'm not explaining this very well. ^^:: My excuse is that it's still early in the morning.
Don't worry about this fic being non-pokemon. You are allowed to have other interests. I look forward to Chapter 1.