The Pocket Monsters anime originally used Japanese writing for on-screen text and signs. A pain in the ass if you need to localize the cartoon into other languages. So the Pokémon folks came up with a solution: a made-up language. A Pokélingo, if you will.
The next Pokemon series, Pokemon: Black & White, is all new Pocket Monsters right up until the end. As previously posted, the anime has two old friends.
Ha! Ha Ha! You were wrong! The duo will be appearing in the upcoming anime, Pokemon: Best Wishes!