>>51657377Well firstly Pokémon being sapient does not necessarily mean they can speak a human language as that might have to do with evolving a voicebox capable of that. However there are also the fact of psychic Pokémon, especially Legendaries, communicating with humans telepathically.
There are other Pokémon that show planning and high levels of intelligence. In Black and White, there are a Zoroark and Zorua which are intelligent enough to blend in with humans.