Forum:Goyo Guardian and Red Dragon Archfiend effects

Alright, scenario: Goyo Guardian attacks face down Man-Eater Bug or some monster with a flip effect that destroys Goyo after it is attacked, will Goyo's effect work? Same scenario with Red Dragon Archfiend, do they need to be on the field after damage calculation for it to work? Will Goyo's effect still work even if he gets destroyed during the damage steps? Same for Archfiend if he gets destroyed by a flip effect. Will their effects work if they're not on the field?