It was the middle of the night. You had set up a tent a few hours ago to sleep in once you had noticed a slight storm rolling closer. After you had set up your tent, you had gotten into your sleeping bag shortly before you could hear the tapping of rain on the walls and roof of the tent.
Lucario, currently your only Pokemon and companion, was sat on the opposite side of the tent, watching you carefully so you could get some sleep. Eventually, you slowly managed to get to sleep.
However, a few hours afterwards, you shot awake from a nightmare, tears trailing down your face in the dark. And Lucario, who was still awake, immediately perked up, rushing over to make sure you were okay.
(If you're a pokemon as well, he will talk. Otherwise, he will not normally)