I think that Feraligatr should be at least mentioned in C-rank
With the rain support it can setup easily a sword dance with its bulky and then proceed to clean with aqua jet. Waterfall is a powerfull stab that can put a dent on any wall, bar the one with water absorb, not to mention if you get the torrent boost. Superpower and crunch both can help against some of his checks, and even ice punch can be used to troll Dragon types. Obviously it need some support to work, but its really underrated and i think that it fit c-rank well.