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I think the core issue was that they just didn't really have anything to actually DO. Most of their time spent in Alola is just exposition dumping and being vague and mysterious. The Ultra Recon Squad are some of the only fictional characters where I can say their designs have more personality than the actual characters (which is funny because I think they actually have very expressive and clever designs). With the exception of Zossie, outside of their body language, there's not really any difference between them all, and I think that really hurt them in the longrun, when they actually have some really serious potential to make an extremely interesting and memorable team with this setup.
They also had absolutely no anime representation and the character made for them for GO is hilariously completely boring and has absolutely no character in his design OR in his dialogue other than " be overly affectionate to the player ". The classic URS really deserved better than Rhi.
We could've had some of the greatest characters in the entire series along with a very interesting plotline, worldbuilding, and potentially themes and ideas, and we got jack.