It's a long story.

[Though that probably sounds bad, huh? She should explain at least a little.]

The Spiritomb weren't so bad, actually. They were just trying to protect Azelf. We hadn't been in this world long when we managed to reach Lake Valor, however, so we didn't know what they were, or understand you're not supposed to touch them... But we got along once they determined we only wanted to help.