This poke could be nice .. on NU, I guess. It has no reliable recovery (we don't know if it gets anythin as an egg move yet, but so far, we talk with what we have), and, while fast, it just doesn't have much of an offensive pressure. A taunt user would pretty much shut it down, without a substitute itself, it is prone to status, with a sub it loses even more health, affected by all entry hazards, and, offensively, it just doesn't have good stats to do much, sans speed. On NU it could work, but I doubt it can go any higher than that. I don't see it be able to wall the OU physical powerhouses all too well.
Edit: LO 252 Attack Garchomp's EQ vs. 252HP/252Def+ : 29,66%-35,31% - 3,05% Chance to 3HKO.
Granted, it can soak up quite a few hits, after all. But still it can't do much other than poison, and it's still quite weak a wall vs taunt users.