There are a few dangerous places in the pokemon world, but chief among them is the Lavender Tower. The Safari Zone and Safari Island have big herds of wild pokemon, but you can usually see them coming and get out of the way. In the Tower you probably won't see what's coming until it's too late ... and when you do see it, you'll probably wish you hadn't.
Now, while not all ghosts in the Tower are evil (it's pretty safe to say the majority of the ghosts there are just mischievous, not out for blood), there *are* bad elements in there. It is a known IC fact that trainers have died in there, and thus it should be a known OOC fact as well. Yes, many (most) people get in and out just fine, but it is ICly known that people do go in and never come out again. The townspeople would warn trainers if asked, and most sane people would not willingly enter the Tower.
Entering the Tower is an IC risk, and by OOCly moving your character into the Tower rooms you are placing the fate of your character into the GM's or puppet-runner's hands. Yes, for the most part people will get out just fine (if a little scared), but death *can* *and* *does* happen. Be aware of that, and of the risk you take by going in there.