The Bulletin Board mystery

Answering the question, how were we getting ‘I’m lost!’ rescue requests from far away?

Legendary rescue leader Lucario has Aura that’s hypersensitive to the distress of others. His outlet is to write up every cry for help he hears.

Either he’s got an injury or he stays by the board because it’s more efficient to delegate. He accompanies random teams when his locating abilities will be most helpful, like if a victim is buried under a rockslide, or when a situation moves him especially.