Weee, glad you finally got it! Actually, you can only get the secret ending in Standard or Proud mode...you can't get it in Beginner Mode. And to get it in Standard, you have to fill out Jiminy's Journal *completely,* which is *very* time-consuming and difficult at points.

Eeek, you're fighting Xaldin now! :O He is really frickin' hard, even on easier modes...mostly I'd say, use reaction commands when they're available (learn/jump in particular is useful), run like hell when he turns his spears into a dragon, and hope Mickey pops in to save you at some point? o_O