I agree. The catching thing should be some sort of mini game where you have to time something. And the timing gets easier the lower their hp is, or something like that. What comes to mind is the reloading mechanism in Gears of War, if you've ever played that.
Some people miss the point stupidly. It's not about being good or bad or useful or not. It's about being so absurdly difficult to obtain as to bring far more frustration than they would be worth, even if they WERE good.
My Anime Harem (No, it really doesn't make any sense.) http://img242.imageshack.us/img242/476/harem01d.png