What if a pokemon faints after Swords Dance is used and I revive it?

Question

Is the attack stat still boosted, or did it reset?

Answer 1

If a Pokemon used Swords Dance move and it faints, the boost's effect will dissapear (But if you Baton Pass to a Pokemon and then back to the Pokemon that used Swords Dance, the effect will still work)

In other words, no. (PS. It's not died, it's FAINT.)

Answer 2

All boosting moves get reset when you switch out. If you faint after a Swords Dance then there is no way to keep the boost because you have to switch Pokemon first. You can't instantly revive your Pokemon and keep going.

Like SuperFlygon said, Baton Pass will allow you to switch out and keep the stat changes. So it could be a good tactic to use that when you're close to fainting.