Pretty much. It depends on the Pokémon, but pretty much all of them can understand humans to some extent. [ and to his follow-up, ] Yeah! It's the same the other way around.

[ never mind people like Psychics, who are literal mind readers and telepaths! they don't count for this explanation, and would definitely make things more complicated. ]

It's got less to do with language and more with... empathy, I guess? We just kind of know what the other is trying to get across.

[ and as if he's understanding Ren's reservations, Duraludon looks at him, pauses for a moment... and moves one of his arms up from its resting position. it almost looks like an offer for a handshake, or at least to urge Ren that he's not as vicious as he looks. it gets a big grin from Raihan, looking at the younger man expectantly. come on, he's trying to be friendly! ]

See what I mean?