Re:pokemon ds screen block dots

for pokemon plat whenever i take a step black dots appear on my screen in different places with each step is there a way to fix that

so playing crash tag team racing for the psp em and occasionaly the sound goes static when a character talks too loud or a sound goes off how i tried putting the len on high but no change how do i fix that and for pokemon plat whenever i take a step black dots appear on my screen in different places with each step is there a way to fix that