One of the defining walls of the past few generations, Hippowdon is able to serve as a the premier physical and mixed wall with ease not. Not much can break through his sheer bulk, with Zard X failing to do so without proper assistance, and yet he is no sitting duck either. He is capable of retaliating back with a great base attack and STAB Earthquake, something that deals respectable damage even without investment, ensuring that most enemies will not leave their match with him unscathed. The icing on the cake though is Slack Off, which enables him to stick around, abosorbing hit after hit for his team with little worry as he can get it right back and adjust appropriately.
His flaws, while few, lie in his typing and special defense stat. While Ground is not necessarily bad, he gets three weaknesses in the form of Ice, Grass, and Water, which are all primarily special attacking types, hitting his weaker special defense stat extremely hard. He is able to patch this up slightly with his great HP, but a low Sp Def stat is still low, making him manageable to most strong attackers as one of his weaknesses is a basic form of coverage from BoltBeam to dragon slaying.
Despite his few flaws, Hippowdon is still one of the best Walls in the meta, taking hits, healing, and hitting back with the best of the OU tier.