I finally got the hotel in Onett finished! By staying at the hotel, you'll receive a full recovery of HP and PP.
The cool thing about the hotel is that you reserve the room for the entire day. Even if you shut off, you will still have the room reserved when you turn back on as long as it is the same day. This works because the Month and Day are saved to array, so if either one is different that it's saved value, you are not permitted entry.
Once a room is reserved, you can cruise around the lobby. Sometimes special characters will be in the lobby.
Also, by talking to a man in the hotel lobby, you can read the monthly newspaper. It's 3 papes long and discusses what's going on in Onett. It's very helpful in keeping up to date.