The only thing I'd like to see added (or elaborated more) is the backstory: why did the three legendary Pokemon protect these items? Are they related in a way? What is the power behind them? I'm sure we will find out through the sequence of the story, but a good, general idea about these gaps would be nice, a least for me. Just a thought; no need to do it.
The use of the FR tiles with the addition of some custom-made FR-styled tiles is what I like to see in a hack and I see you implemented that in your hack. I don't have anything against completely new tiles, but the FR tiles are more 'easy on the eyes' for me. The scripting looks more than decent, the grammar is perfect, and the events look intriguing. I'm sure you'll enlighten us with some professionally-made and good-looking scripts later on. The characters aspect is the most I was impressed with, especially in Jack of Hearts and Cyan. They look like characters that could spice up the hack and orchestrate a fun game to play.
Overall, this hack looks promising enough and I'll be sure to follow the progress you will be making. Best of luck on this, mate, and keep us anticipated.