So we both agree that most if not all Anime Pokemon can learn how to speak a human language just as Meowth did due to the framework being right there. Now just because a Pokemon can learn how to do this, doesn't mean they want to or will try to learn it. Even Pokemon who have jobs or goals or dreams that would greatly benefit from speaking a human language do not wish to learn how to speak. Why? The reasons vary, some may find it weird, some may not want to put that type of effort into it, some may not want to lose the moveslot for this, and some feel that humans and pokemon understand one another enough to where they don't need it at all. And probably more reasons than that. Mentioning the games as I said before is pointless in this discussion, we are focusing strictly on the anime.>The thing is that the anime itself does paint Meowth as a unique character such as Jessie proclaiming Meowth ability to understand human speech makes him unique
Meowth being 'unique' is technically true and also technically not true in that he's a Meowth who chose to learn how to speak, but its important to note Meowth himself is not a 'special/unique Meowth'. He wasn't born differently from other Meowth, he wasn't born with unique skills or talents, he wasn't born with more intelligence or with special human level understanding, he was and still is a regular Meowth. The only 'unique' thing about him is that he made a **choice** to **learn** a set of skills that most Pokemon aren't interested in learning. With all of that in mind, Meowth simply proves that with hard work and determination a Pokemon could learn how to speak a human language if they so chose to. No matter how they are born.