As the submitter of theorymons, I do think about flavor justification and while Liepard isn't the slam dunk that Intimidate Cobalion was, I think it fits:
1) Liepard's Pokemon Black entry states "These Pokémon vanish and appear unexpectedly", which to me indicates some sort of power over darkness, shadows, and voids and could potentially be further stretched to Liepard inducing sudden sleep to change its position.
2) Liepard learns Sunny Day, Rain Dance, Thunder Wave, Shadow Ball, Dark Pulse, and Dream Eater, but nothing in its Pokedex indicates it is supernatural beyond that one teleportation line. But to me, those are the justification to add Dark Void to the mix, as a compliment to the "Dark Aura/Dream Aura" powers it already has.
Finally, I also thought that the point of this whole exercise was to focus on how we can alter a Pokemon competitively first and foremost, to try and predict and then test how that change would alter the entire metagame, with flavor being strictly secondary and "just gravy" on top of the competitive idea. To quote ;lmlm:
If you don't think Liepard + Dark Void should get in, don't vote for it. But don't reject it on some flavor stretch because you don't like it - there's plenty of intelligent discussion so far on why Liepard is too much, too centralizing, too unhealthy. And that discussion, whether I agree or not, is the point of the thread.
