Plus, it would be amazingly weird for Zangoose to get a Mega and Seviper not.
(Similarly, if Ninetails gets one, so does Arcanine. Or Magmar/Electrabuzz, or such.)
Sandslash, Lapras, Dunsparce (with a fairy or dragon type?), Ludicolo, Mightyena, Luxray, Breloom, Emolga, Mienfuu, Donphan, Parasect, Shuckle (with a typing or ability to make it immune-ish to poison. Magic guard would be insane) , Scolipede, Ferrothorn, Purrloin, and Druddigon are the ones I most want to see.
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But I don't forsee any gen 6 mons getting it, (legend aside) and gen 5 they clearly want to hold back on… which makes sense, those mons were created more recently and can still be marketed as themselves, and are more balanced stat and ability wise to the current game.