I don't want to talk about BP too much because I have little experience with it.
Moving on, I think Infernape could move down based on how its niche compares with other B-/C+ mons. It's more easily exploitable on its defensive sets than other B- mons. Its well of variety is shallow compared to Toxicroak and Scizor because its offensive objectives have so much overlap with Victini, Entei, CharX and its defensive/support set relies to an extent on forcing switches based on the assumption that Nape is an offensive variant/has coverage. It's a lot like Alo in a support role; it's good, but it really does need a fifth slot to provide enough support to make it generally useful.
I agree with a magneton rise. The speed rise is useful enough to be situationally useful; Magneton's speed with a scarf is tolerable when Zone's can be frustrating.
Moving on, I think Infernape could move down based on how its niche compares with other B-/C+ mons. It's more easily exploitable on its defensive sets than other B- mons. Its well of variety is shallow compared to Toxicroak and Scizor because its offensive objectives have so much overlap with Victini, Entei, CharX and its defensive/support set relies to an extent on forcing switches based on the assumption that Nape is an offensive variant/has coverage. It's a lot like Alo in a support role; it's good, but it really does need a fifth slot to provide enough support to make it generally useful.
I agree with a magneton rise. The speed rise is useful enough to be situationally useful; Magneton's speed with a scarf is tolerable when Zone's can be frustrating.