If I remember correctly, I didn't even use any special crater, I just walked to the area just past Rin's shop, waited for the flash of light (not the sound, that's too late) to press X, walked forward a bit so I wouldn't zone after too many jumps, and just repeated that until I counted out 200. It really is simpler than both of you are making it. Except for the brightness, I can understand that getting to some people.