I mean it as if your own Pokemon uses explosion and survives... If so, that'd be epic.
HB
Of these, only #1 allows the user to deal damage with Explosion/Selfdestruct without fainting. The others just prevent it from being used in the first place.
Explosion (Bulbapedia) Self-Destruct (Bulbapedia)
Actually, there is. When your opponent has the ability Damp, the move will fail, causing you not to faint.
No they will always faint.
Source-Experience
No because Focus Sash and Sturdy will not protect you from it.
This is because Focus Sash and Sturdy protect you from the enemies OHKO moves.