Arcanine is weak to Stealth Rock. None of its stats are particularly impressive anymore due to the power creep. Its strongest and most consistent attack has recoil. It is completely outclassed in OU and VGC. Its Hidden Ability is useless. It doesn't get dual STAB. It did not get an Alolan form, while its counterpart Ninetales did. Evolving it from a Growlithe causes it to no longer learn as much moves through level-up. None of its coverage moves are particularly noteworthy except for maybe Close Combat, and even that has a negative side effect. Its priority does not get STAB. It is completely walled by most Dragon/Flying 'mons if not running Outrage, as well as most Ground-types. Its recovery move is affected by weather and only has 8 PP, max. It's not that hard to scare out, is vulnerable to all entry hazards, does not get a way to counter how easy it is whittled down such as hazard removal, a useful ability, or reliable recovery, its Intimidate is hard to use due to its weakness to said hazards, Heatran is a way better Flash Fire user, and Lucario is a better Justified user.