Alchemist archetypes that give up mutagen and/or bombs (or a pair of them that each give up one and can be used together). I still don't understand why Vivisectionist is not allowed in PFS, but I don't like that every alcehmist is pegged into being a mad bomber/Dr. Jekyll.
I'm pretty sure that vivisectionist is banned because it LOOKS unbalanced. I mean, sneak attack by it self is nothing but at 20th lv. you've got +8 str from mutagen, +4 str from bulls str infusion AND 10d6 sneak attack. That looks highly unbalanced (I say looks from a just quick look at the numbers, after doing the math it's probably not as bad as it looks.)
Most classes only have two ways to give them a small boost to attack and damage OR one bigger way. Barbarian gets rage, cleric gets spells and some domain powers, druid gets wild shape and bulls str, fighter gets weapon training and wep spec, ranger gets favored enemy and bulls str AND lead blades, Paladin gets smite and divine bond, ect.
The bard actually gets a lot as well but nobody complains about them for some reason. They are essentially a full BAB, 6 Lv caster, with 6+int skill points.