Protein??

Cost: 5.5 sec to use whenever doing a heal at some point during Nimbasa Gym (or later if no Static LOL)

Gain:
Charles: Sigilyph 1/16 --> 3/16 if no additional damage from partners
Plamsa Ship 1 Koffing: IH is 1/16 --> 3/16
Marlon's Jellicent: EQ at +0: 2/16 --> 3/16 to OHKO
Gligar: IH 2/16 --> 3/16 to OHKO
Zinzolin Double Weavile: EQ 13/16 --> 14/16 to OHKO
Iris's Hydreigon: 4/16 --> 5/16 to OHKO
Iris's Lapras: 15/16 --> 16/16 to OHKO


Others:

VR Spinner's Skarmory goes from 1/256 --> ~2.3% to 2HKO with Rock Slide
Caitlin's Musharna would go from 3/16 --> 4/16, but not going for the range anyway.
Skyla's Swoobat: Rock Slide 2/16 --> 4/16 [Wouldn't go for this anyway I don't think. Iron Head doesn't trigger heal

These calcs all assume no spinners; so no extra Exp/EVs. In some cases, this would mean other ranges come into play (E.g. if hit spinner for Exp, Lvl 76 for Cofagrigus, Protein would take it from 11/16 --> 12/16)

Decision:

Hard to call. Atm the Lapras one is making me lean towards yes. Missing that would be devastating.