I haven't seen or used smeargle or cranidos so I'm not going to say anything about them
Spritzee: has better bulk than Giratina as well as a better typing (both offensively and defensively) Gastly, Cranidos, Grimer, Bellsprout, Stunky, Croagunk, Skrelp, Ekans, Spinarak, Nidoran-M, Venonat, Toxicroak, Muk, Victreebel, Seviper, Trubbish, Skorupi, Nidoran-F, Garbodor, Qwilfish, Skuntank, Beedrill, Crobat, Drapion, Weezing, Ariados, Weepinbell, Zubat, Gulpin, Arbok, a bunch of physical steel types, and Magnemite can take it out offensively assuming 252 HP, 4 Def, 252 SpD Bold. However, among those only Gastly, Cranidos, Stunky, Croagunk(?), Bisharp, Meggron, Magnemite, and Bellsprout are actually viable for other offensive things and Cranidos is being suspected. Ontop of this no competent player will ever leave a spritzee in on a steel or poison type (immune to toxic)
It's better than Gira at support because of being able to wishpash and use aromatherapy to help the team while also being immune to taunt.
Against stall it has toxic for non-steel/poison types and aromatherapy(and refresh) to heal itself of toxic or burn
tl;dr: Spritzee is too bulky for any non-offensive non-steel/poison type(which it wouldn't stay in on anyway) and can consistently wall even most of those with the right EV spread. It also fairs fairly well against stall. Ban.