Ruling Dialga and Palkia prime?

[Ninja Pikachu]

If i use

[W][C][C] Sudden Delete: Choose 1 of your opponent's Pokemon. Return the Pokemon and all card attached to it back to your opponent's hand

on my opponets last pokemon do i win or is it ineffective???

 

[DNA]

If you use it on your opponent's Active Pokemon, and it is the last Pokemon in play, you win, because your opponent cannot replace the lost Active Pokemon.

If it was ineffective, it would say (If your opponent has no Benched Pokemon, this attack does nothing.)
But it doesn't.