No NO nO NOnOn NoNonO and no!
Shadow tag was banned for a reason,there was a poll for it and its better this way,the meta game is more healthy,we already did two polls for it,no point doing a third one,please let it be the way it is.
Shed shell doesnt change anything at all! SHED Shell has nothing to do with shadow tag,even if shed shell is here,why does it have anything to do with Shadow Tag ban? Do you use Shed shell on amoonguss,blissey,chansey,tangrowth,no you dont,SHED SHELL being added doesnt change anything to Shadow tag!
EVERY reason why it should be banned is stated here https://pokemonrevolution.net/forum/viewtopic.php?t=63214