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Yeah he seems pretty niche to me, he's got better special bulk though and an immunity to fighting type moves over it. Would also have been an awesome m-kanga counter, probably? never tried it, though...
Edit: Not counter, check
How viable is Jellicent actually? Cuz I don't think I have seen it once... I mean ghost as a defensive typing is not that good anymore, and it's defensive stats are not able to handle the power creep either (especially it's sub-par def stat) It still spreads burns around like there's no tomorrow...