At least Treeko evolves into something decent later in the game. As does Magikarp, and Feebas. Heck, even Farfetch'd has use as a Pokémon Catcher. Ditto has breeding usage. Bidoof as an HM slave. But one Pokémon that has absolutely no use (other then to make teams spelling abstract words and profanity) is Unknown. It's STAB is now average at most (and you're not guaranteed to get a STAB attack, either), it has sub-Clamperl stats, a copy-paste ability that aids it in very minimal ways (Switch into Tyranitar's EQ? Great. Now try and KO it.), and a single move, making it so you can't even use it as an HM slave. It's mentioned that Unknown are much stronger when in groups...Too bad Pokémon is a 1v1, 2v2 game.