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There is a Legacy version here.

PFS StandardMega Bomb Feat 20

Additive Alchemist Manipulate 
Source Player Core 2 pg. 69

You can add a highly explosive additive to an alchemical bomb to turn it into a mega bomb. Throwing this bomb takes a 2-action activity instead of a Strike. This isn't a Strike, and you don't make an attack roll. The mega bomb explodes in a 30-foot burst within 60 feet. It deals damage as if each creature were the primary target, with a basic Reflex save. On a failed save, a creature also takes any extra effects that affect a primary target (such as off-guard from bottled lightning). Though all targets in the area take splash damage as primary targets, there is no further splash beyond that area.

Traits

Additive:

Feats with the additive trait allow you to add special substances to alchemical consumables you create when you use Quick Alchemy to create a consumable (you can't use additives with quick vials). You can add only one additive to a single alchemical item, you can add an additive only once per round, and most additive abilities specify a subset of alchemical consumables you can add them to.

Manipulate:

You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can’t perform actions with this trait. Manipulate actions often trigger reactions.