I don't know. . . I always level up as much as possible, when ever possible. When I first beat the game I beat them without D. train, or B., OR meltdown, or a lot of other stuff. But at level 38. . . I don't know. I think you can get meltdown from Ruby Dragons. . . but they'll be REALLY hard to kill at lv. 38(I think) there's likely to be easier monsters to get it from, but I can't think of any. . . sorry.