I accidentally KO'd Virizion!

Question

I was playing Pokémon Black. I was trying to catch Virizion( I already caught Cobalion & Terrakion) but I accidentally made Cobalion used Sacred Sword, thinking it would keep its health in the red zone. Can I catch it again sometime?

Note: I already beat the Elite 4 once.

Answer 1

Defeat the Elite Four again. Virizion will appear again at the same location. This works with every legendary in the game.

If you save before fighting a Pokemon like this, you can soft reset (by pressing R, L, Start and Select simultaneously) to try again if you KO it or run into some other problem.