I'd put Medicham pretty high (like B+ or A). When it doesn't miss HJK (and mine usually does cuz game likes to troll me) it destroyes opponents mon.
Honchkrow (B to B+)- I like running crit set with scope lens, Honchkrow helped me a lot, however I'm not sure if it'd be so useful without EV investment.
Pachirisu (C ) Great additon to the team early on, but not so great later on
Greninja, ehhh I'm not sure what to do with this one, if we ignore the fact that it's lame till like Luna it is definitely S rank (or at least A+), untill you get dark pulse extrasensory is its only atk worth of mentioning, so I dunno.