Originally Posted by Fat Ojama
252SpAtk Life Orb Hydreigon (+SAtk) Draco Meteor vs 252HP/252SpDef Hippowdon (Neutral): 73% - 86% (307 - 364 HP). Guaranteed 2HKO.
Slack Off etc. Also, I don't see how Hydreigon is attracting Mence's and Luke's checks and counters since it hits on the special side while they both hit on the physical side. Do you really think your opponent will send in slowbro against hydreigon ?
Of course Special variants can survive a Draco, but he did say that it has a chance of outright KOing Physical variants. He's right. 252 SpAtk Life Orb Hydreigon (+SpAtk) Draco Meteor vs 252 HP/4 SpDef Hippowdon: 98.57% - 115.95% (87.5% chance to OHKO)
It takes a lot of Special Defense investment for a Hippowdon to comfortably stay in on a Hydreigon, seeing that little special investment will most likely result in a KO. Factor in Stealth Rocks, and it takes at least 100+ EV investment. Most Hippos prefer as much physical bulk as possible however in order to counter Terrakion and Mence. All in all, the core doesn't reliably handle Hippo, but Hydreigon doesn't have too much of a problem doing it.
Rarely used anyway, according to this month's usage stats.