To be honest, if you're looking for a fast lead Pokemon, you should really be using Deoxys-S while it's still in the OU metagame, as Azelf said. It's just tons better and has access to more powerful moves, Stealth Rock and Magic Coat, which can really help against other leads.
And also about your sun counters, I'd actually invest in using something like an Offensive Poison Heal Gliscor, maybe over Accelgor or Toxicroak, since it doesn't look like they're doing much. They're immune to all these Earthquakes that Garchomp and Landorus would be throwing your way, and can hit back with Toxic Orb and Acrobatics or something. It's just something to think about. :)