Oh good, just making sure you were forewarned! Because it can come as a surprise if you aren't expecting it and you wouldn't believe how many people don't check things with the 'dex the minute they get them.

Really it's not just ghosts you should check though, it's everything. For example: did you know that Umbreon sweats poison despite being a dark type and not even half poison? It doesn't even naturally learn any poison type moves.