In HeartGold, when I'm walking with my Pokémon in the tall grass, and I talk to them, the message comes up that "----- seems to feel a little claustrophobic" or "----- is a bit nervos about the tight space." Why is this? It only happens in the tall grass. Is this just what all Pokémon feel / say in the grass?
(My team is Golbat / Quilava / Geodude / Weepinbell / Slowpoke / Ariados.)