If Synchro Summoned using "Dandylion", This ① effect can only be activated as Chain Link 2 (the tokens will be summoned after all cards are destroyed).
Removing 1 Plant-Type monster in your GY from play is a cost.
The second effect of "Black Rose Dragon" targets 1 monster your opponent controls.
If the monster targeted by the second effect of "Black Rose Dragon" is not changed to Attack Position by the effect of "Black Rose Dragon", its ATK is not reduced to 0.
If you target a face-down Defense Position monster, its Flip Effect will activate after the effect of "Black Rose Dragon" resolves.
After a monster's ATK is reduced to 0 by the second effect of "Black Rose Dragon", if another effect increases its ATK it will be applied to the 0 ATK.
If "Black Rose Dragon" activates its first effect, it is also destroyed.