you should save before you battle it so if it faints you can turn off your game and battle it again
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Its too late.
When you knock out a roaming Pokemon, it will faint and then start roaming again, but with its health at full.
Well technically, you can't KILL a Pokemon. You can just make it faint. When you make a legendary Pokemon faint, it will be gone until you start a new game.
You would better hope u saved the game.because after u faint cobalion, the Pokemon will never come back. That was your last chance
Goldbat evolves when it's happy enough. Just battle with it for a while without letting it faint and you should get your Crowbat pretty quick