I was originally going to ask what Pokemon people think Ash should catch if he had a Master Ball, but instead I wonder how everyone thinks Ash would handle the prospect of using a Master Ball.
Hopefully he wouldn't just throw it in a Wishcash's mouth (though considering how May caught Munchlax after it ate the ball, I don't get why a Master Ball failed - yay for plot consistency) - but does anyone think Ash would actually use it in the way that you would on the games and catch a legendary, or would his approach to making friends with the Pokemon he catches and basically asking them all for permission mean that a Master Ball would be counter to his style.
I found Ash's capture of Palpitoad really odd in that it seemed to be the first time he caught a Pokemon that he hadn't befriended in some way before hand. Would that change in BW make Ash more likely to take advantage of the power of a Master Ball?
Certainly don't think it's likely that the anime will ever do another Master Ball plot, especially not one involving Ash getting one, but I'm interested in your thoughts on how Ash would respond, and what situation he would use one in.
My view is that he'd only use one if a Pokemon was injuring itself in the wild and nothing else was working to settle it down - that he would use one for the benefit of the Pokemon; similar to Lance and the red Gyarados.