The game looks quite nice, Nytkoi. :D It is sorted out and organized quite well, but there's a few things that need a bit of touching up, but they are just small problems. They are mainly little oddities, so don't worry.
First of all, the title screen looks nice overall, but looking closely at the "Pokémon" logo, it looks a bit odd. I think you should just use the original sprite/image, so it doesn't look so weird. :3
Secondly, the introduction sequence's background... The colors were as if they were chosen quickly. The darker colors on the bottom should be a little more closer to the brighter color on the top. This will add an effect that the colors are fading darker toward the bottom, and not just random shades of purple.
Use this if you want. :]
Next, and you should know this, but the sprites (overworlds and battle sprites, the only sprites I have seen so far) need quite a lot of work. But I'm always here for you when it comes to sprites. =D
Anyway, good luck with Moonlight, Nyktoi. :]