Dusknoir is combated by anything that can knock out by effects, like poison, burn, or placing damage counters. Unknown G can stop all this. But if you can manage knocking out Dusknoir while it's on the bench, Ectoplasm takes no effect. Possible by means of Magmortar, Blaziken, Empoleon, Etc.
Until GC comes out there's nothing to stop bench damage besides Bastiodon anyways, and i haven't seen a Bastio tech... ever. How to bench Dusk? Well there's Warp Point, PokeBlower, PalkiaLvX's resteructure, and Lumineon's powers.
There's a lot of ways around this, and if you really want to beat Dusknoir Lv X you just have to get creative.
I personally have built a straight Blaziken with just Rayquaza and Claydol for backup, 4 warp points and plenty of ways to do 80 damage to anything i want, every turn. And while it works well against Dusknoir it is no slouch against Kingra, despite weakness, and Luxray (no LvX in this deck) and if my opponent wants to use gengar, i'll G the clay and ray while i knock out their claydol and uxie.
No card is broken, as long as its enemies can work around it one way or another.
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the card is amazing, notice all the people saying unknown G would stop this/that, how many of you Actually play G or have played against unknown G???? chances are slim cuz with so much good stuff out right now, for a lot of players there is simply not enough room to warrant making space for unknown G for a "just in case" sernario that they run into dusk/gengar. id rather just use that space to make a good enough deck that can handle dusk if i run into it then devote deck space to specifically "deal" with it. cuz if you dont run into a dusknoir or gengar deck, you've just wasted a card slot that could have been for something more useful.
now those counter techs are really circumstantial. Back at worlds i teched Island Hermit specifically for Gardy/Gallade since it was clearly THE biggest deck to make a show.
Unknown G might be hard to tech most of the time, but then there's Felicity's to discard it when needed, or your deck can run solely on the G combining with something else for a double whammy effect like my secret steel deck lol