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I was thinking that as well, but I think it might be "Type Specific" instead. I'm sure Magby can get the "Your pokemon spit out a fireball" message, but clearly, Chikorita won't be able to. At least, I don't think so. That'd be a bit odd :/
I think some of the emotions (or reactions, I suppose) are pokemon specific. If not, there are A LOT of emotions, which is an awesome thing. Here are some of the ones I've encountered with my starter pokemon.
Cyndaquil looks like it wants to lead! (Happy)
Cyndaquil blew out a fireball. (Music...