>>51473419Darkrai was already inferred to be a non-unique mon by virtue of the main anime one and the movie one blatantly being different.
Most legends aren't actually unique. I think another darkrai even showed up later?
The point is unless the mon in question is some dumb godlike being, its probably not unique. Why does Darkrai come off as unique exactly? Its just some nightmare monster.
Manaphy clearly can't be unique either, Shaymins non-unique aspect is incredibly pushed. Why would darkrai be an exception?
>>51473424He's canonically nothing, the fact that he's just nowhere in JN is because the anime can't actually handle this kind of character existing.
By all virtues he fucked off post the tournament because the writers can not actually have this kinda character exist, as he's actively competing and at a point where he should very quickly escalate past any viable opponents.