However, Mokou had already seen through everything.
Original version: However, Marshtomp had already seen through everything.
This originated from Pokémon X and Y. While being 3D and all, many players soon noticed that this version of Marshtomp has an unusually dull look on his face, compared to his cutesy look in previous games.
People started to ask:"Just what the hell did Marshtomp experience in these past years?" And a meme is thus born. Marshtomp must've seen all the nasty reality of the world, which left him in a tranquil state. When he stares at you with his dead eyes, you know that he sees through everything you are doing. He had seen it all, and nothing surprises him, not anymore.
