Ferrothorn is a great glue Pokemon in the current metagame, not only as an entry hazard-setter but also at checking countless things, first and foremost the dangerous rain teams, which are a staple in the ou ladder recently, but also in tournament games, where rain archetypes are egtting used. So for the team it can help with Barraskewda and occosionally Azumarill. Furthermore it established itself as a great Pokemon ON rain teams as they appreciate the longevity Ferrothorn has with Leech Seed and moreover they appreciate having it on their teams as it grants them an electric-resist and grass-resist. I think its A+ ranking is justified and deserved and it shouldn't drop unless the metagame really trend in a direction where it's getting more troublesome for Ferrothorn to fullfill these roles.so why ferro is A+, the only S tier and A+ tier mons it can checked are ferro, pex and slowbro. Like urshifu destroys it, +2 chomp eq destroys it, phero CCs and specs spectrier 2 shots it. what kind of defensive utility can it provide of?