yes they have, hundred eyes dragon,underground arachnid,frozen fitsgerald
The 'Dark Synchro' archetype will almost certainly never be brought to the TCG. The main reason is because almost all of the Dark Synchro Monsters from the show, have already been released as regular Synchro Monsters instead. Zeman the Ape King, and Underground Arachnid are two, both regular white-bordered Synchro Monsters.
The Dark Tuner and Dark Synchro Monsters have yet to have been released in the Official Card Game (OCG) in Japan, so it is very unlikely they will be made available in the United States.
The 'Dark Synchro' monsters as depicted on the anime, do not exist in the real card game. All the 'Dark Synchros' that have been released as real cards, have all been released as regular Synchro monsters instead. So cards like Underground Arachnid, Zeman the Ape King, etc, are summoned like regular synchro monsters.
you cant
You Synchro Summon it with Tuner monsters and Non Tuner monsters that adds up to the level of the Black Rose Dragon. Since BRD is Lv7 you need monsters that would add up to that number.
get a dark signer to be your partner, go to the card shop, once there a card pack will have appeared, if you buy enough you will find dark synchro monsters in it.
They may be released after a while as konami are busy making the majestic tuning cards and the shooting star dragon. I also hope that they will release the dark synchros All but one of the 'Dark Synchro Monsters' from the show have already been released as regular Synchro Monsters. Zeman the Ape King, Underground Arachnid, Moon Dragon Quilla, Hundred-Eyes Dragon, Frozen Fitzgerald and Dark Diviner are all out (the last two only in Japan at the moment) so Dark Flat Top is the only known one remaining that is still anime only and with a negative level.
Destroyed monsters go to the graveyard, including destroyed Fusion or Synchro monsters.
Synchro Monsters are placed in the Extra Deck along with the Fusion Monsters at the beginning of a Duel.
You may have a total of 15 fusion and synchro monsters in your extra deck(renamed from fusion deck with the addition of synchro monsters)
Yes they are coming out with the naturia beast and naturia leodrake synchro monsters in hidden arsenal 2
You don't tribute anything, it is a Synchro Monster. You have to send a Tuner and one or more DARK non-Tuner monsters from your side of the field to the graveyard. As per the usual Synchro rules, their combined level totals must equal Dark End Dragon's level, which is 8.