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Unown might be the biggest loser in terms of the Pokemon themselves. If you watch the 3rd movie, it’s clear that they’re meant to be something like Zygarde or Wishiwashi where they’re incredible weak alone, but in large groups they’re far stronger. Maybe even surpassing legendary Pokemon in power in the case of Unown.
But they never added any mechanic in the games where you can gather together a bunch of them. You just get one at a time and they have garbage stats and no gimmick at all. Nothing happens if you manage to collect one of every letter.