You're in for a loooooooooooooooooooooooooooooooong time of suffering. Ghosts tend to be on the later side of blooming bar a few exceptions. Honestly you were better off adding a misdreavus or sableye to your team, oh well. There is also good news however you can get a full team before Corey, you should be able to catch a shuppet and a drifloon before fighting him.
Edit:
Wow I think you would have given him a much better team at least early game.