So, Obstagoon has two abilities: Reckless and Guts. So you got your pick of really powerful recoil attacks (STAB Double Edge is likely one of its attacks, and possible a recoil Dark-Type attack), or really powerful attacks in general with a status condition.
Now, assuming it carries over Extremespeed from the regular Zigzagoon line, I see no reason to use Reckless over Guts. A Guts boosted STAB Extremespeed hits like a speeding truck. Of course, so does a Reckless Double Edge with Belly Drum, if you want to hit extremely hard, but also die. ._.
If Obstagoon gets Switchroo from the regular Linoone, I'm totally gonna try for a Toxic Orb set with Guts. Extremespeed, Crunch(?), Switchroo, and a Coverage Attack. ;p
It's a Dark/Normal type, which is both good and bad because it has immunities to Ghost and Psychic, but a 4x weakness to Fighting.
I don't care what people say, I'm willing to give Obstagoon a chance, here. It's got some on paper potential, and I just don't believe it's time to write it off yet. It's not OP by any means, but I believe it's going to be more usable than, say, Alolan Raticate. Looking forward to trying it out.