I don't think metagross should move up as it has severe 4mss as it wants rock slide/eq/zen headbutt/grass knot/meteor mash/bullet punch/ice punch/pursuit.No matter what u run ur walled by something nasty and as MS mentioned it also has a degree of opportunity cost due to mence being such a beast and also because there are steel types that fulfill it's roles better such as mega Scizor who has the added niche of checking gengar and checking ekiller.I think regular sab is decent as most deo-s run skill swap to beat mega sab and magic coat isn't a common sight so sab is a fantastic anti lead it's also one of the best Ekiller checks and also check other SD arc formes by the virtue of will-o-wisp and foul play and doesn't get out sped and destroyed by them due to prankster and prankster will-o-wisp plus taunt is extremely annoying.Sure,the dominance of Primal Don hurts it but it doesn't like taking repeated foul plays and also another benefit with regular sab is that not only does it fulfill most of the roles of mega sab(checking Ekiller for example) it also allows u to run another mega preferably mega croissant.Just my thoughts :].
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