I think Ferrothorn will will because it can Leech Seed and Ingrain for health and can even Iron Defense for Defense. It can even use Bulldose while most of the KlinKlang moves are no t very effective on Ferrothorn.
Agreed. Most of the moves Klinklang can learn aren't very useful against a Steel/Grass type like Ferrothorn. And yeah, like Aryan said, Ferrothorn can learn Bulldoze, so Klinklang can't do much. Klinklang has OK Base Attack and Defense, but its Defense is nothing compared to Ferrothorn's 131 Base.