I am guessing it was because Garchomp was the poster-boy for Sand Veil.
Remove the Sand Veil and all of a sudden he's not Uber.
i believed this was the case as well, in which case the banning of sand veil would have a cause/effect relationship with the unbanning of garchomp (ie sand veil is banned, THEREFORE garchomp no longer needs to be banned).
however there are also people who hold the reverse opinion, which is that we want garchomp back because it can potentially improve the game (i neither support nor oppose this opinion
), but to bring it back we first need to ban sand veil otherwise it will "probably remain uber" (i neither support nor oppose this opinion
), ie "garchomp is unbanned, THEREFORE sand veil needs to be banned". what i want to know is which of these positions is correct, or if there is a third one that i am missing. it's possible that the "real" answer is somewhere in between those, ie "sand veil is banned, THEREFORE garchomp no longer needs to be banned, and in addition garchomp needs to be unbanned to improve metagame balance". it's even possible that there is no answer and the council is just trolling me, but my opinion of smogon is a bit too high for that.