[That's actually an interesting question, especially to a Pokémon scientist.]

... From what we know, Pokémon do not seem to have any particular difficulty with communication amongst each other, and the majority seem to be able to understand human language with no issue.

[Herp derp totally.]

... I believe so, though... the specifics are not well-known, especially not with Pokémon. That is, of course, what our jobs are for. [And he smiles a little.]