Wow, that looks like the real deal! Keep it up, since you don't plan on adding a full on map, maybe take a linear route and after battles have a menu with a shop with battle chips. Maybe eventually have multiplayer. *gasp* You could possibly have the chance to let us have something simillar to MMBN 4.5 (but let us control our Navis).
I got that sprite from a search in google. I'm using 8 bit sprites because the sprite page is too small.
Now, I tried to mimic the sprite from the game, but it doesn't look ok.
Raimondz im kinda glad your remaking my childhood (because im a teen and my birthday was last week and my big brother had the game when i was around and whenever the gameboy and original ds were around) i just cant wait for you to release it words cant describe my happiness. :D