Not bad I have some suggestions, though.
Firstly, you're using loads of resized battlers; I guess this is to fit them within the 64x64 box. However, I think that instead of doing that, you should resize your resolution to DS resolution rather than GBA resolution. Although it will take a while to adjust everything, it will really make it look better.
Second, you spelled 'hygiene' wrong
And finally, the title screen looks great. The only thing I don't like is the 'Touch to Start' text. Pixel fonts never look good when resized; either use the font at a multiple of the intended size, or choose a vector font instead.