Originally Posted by Fat Valentine
It simply cannot muscle through things like Steelix, Escavalier, Tangrowth, Aggron, MAGNETON, Unaware Quagsire, Rotom-N, Sandslash, and Ferroseed. If it's packing HP Fire over Wild Charge, then common things Kapu, Omystar, Moltres, and Poliwrath wall it, and retaliate with their Water, Fire, Fighting STABs respectively. If it had access to moves like Superpower, Earthquake, and Stone Edge, i would whole-heartedly agree with a B Rank..
However, because of how many counters it has due to it's limited movepool, I believe it fits the C Rank definition better.
Just a small nitpick, Klinklang can actually turn ferroseed into set up bait by using Substitute, as ferroseed is completely unable to break Klinklang's substitute in one hit even with a maximum power gyro ball, from there Klinklang can set up with shift gear to +6 while PP stalling gyro ball's measly 8 PP, then it can stall for lefties recovery and knock out ferroseed, otherwise, your point is sound when it comes to coverage problems.
Also, sorry, i didnt see that you mentioned that Skuntank can use explosion in your other post haha :P.