Question

I have a Strategy for my poison team to save my Crobat, who has low defense. First, I send out Weezing, who uses Destiny Bond. Then, I Have Weezing use Memento. Would The Foe Go Down With It?

Answer 1

No. destiny bond only takes the foe down when they attack you directly, attacks at your own hand won't faint them. Plus destiny bond only works in the turn you use it. your pokemon must faint in the turn it's used, after that, it has no effect. So using a move on the next turn can't trigger destiny bond.