For a start, Darmanitan's OU. About Arcanine, Entei does have 5 higher base Speed, and if speed is a problem then maybe try some sort of "Scarftei". Also, Flare Blitz is not the only fire move. If speed is a problem, then use some special Timid set. Some sort of CM user or Sunnybeamer would do the trick.Darmanitan and Arcanine are much faster since they don't have to use Adamant for Flare Blitz.