@Lucario Guy
Well. Let's just look at Flareon first. It's Pure-Fire. Going to be very honest, but Pure Fire, is just very sad...Weak to SR makes it a downer already.
It
does have 130 Attack and with Flame Charge I see where you're going. But even with Guts Adamant, Bite and Rock are
close to in-valid in OU.
Anyone can tank those and in a Drizzle infested Metagame, Flareon has little room to shine.
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I do want to bring up this one Pokemon, that I think people need to go back to for pure destruction and diversity:
It has the tools to by-pass it's weaknesses. Although it is not possible to bypass all problems.
With Tailwind and/or Paralysis support from either it's own set or teammates, Hydreigon won't be intimidated by that mean Terrakion or Latios anymore.
With Substitute up, Hydreigon can
really f*ck you up [excuse my language]. Techniloom? Gone. Terrakion? Gone. Latios? Gone.
Also we have to keep in mind his
8:4 resistance and immunities/weakness ratio.
He also has some very solid bulk to work with. Having roost helps a lot too :]
Hydreigon can also go mixed and honestly take Stall Teams for a trip to hell and back.
Finally, we can't forget how well he can fare against certain weathers, more Drought than anything but Hydreigon is pretty handy for non-weather teams.
On weather teams, he can shine just as well too.
Hydreigon is just a beast, packing the power and coverage to 2HKO or OHKO literally anything in the OU metagame.
Use him. ;]