Pokémon Diamond and Pearl/The Lost Tower

There is really only one reason you need to go here, and that is for HM Strength. As for anything else, there are a few other items here, but the trainers are farily weak, so grab what you need, battling the trainers along the way. On the fourth floor you will see two old ladies. One will give you HM05: Strength. The other lady will give you a hold item. You're done here for now, so go ahead and head on out!

Pokémon

 * Ghastly

Items

 * HM05:Strength