Why do my Pokémon feel claustrophobic?

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.)

Pleaselog inorregisterto add a comment.

Well, it seems that Pokémon can have different feeling depending on the location or in certain situations . On this [source][1], I found a few

-Doing warm up exercises-Suddenly hugging you (:>)-Staring at the Pokéschool blackboard-Watching your footprints in the sand-Greeting other Pokémon-Being alarmed at rain-Dancing-Playing in rain puddles-Route 47: Being afraid of the cliff-Icy Path: Staring at own reflection in the ice/Being startled by reflection/Slipping on ice-Charcoal Man’s House: Smelling smoke-Shops: Look at shelves-Poking at garbage-Sniff peopleAnd many, many more.

So it seems to be a cute feature that they put in :D[1]:http://bmgf.bulbagarden.net/f226/so-your-pokemons-reactions-can-change-depending-your-location-56068/