I cant seem to get the brock through walls right,

after i talk to the guy from the right i start to walk away but am hit by a cloud of some form which i haven't seen on other videos

after that when i try to walk through walls sometimes the start menu opens up and sometimes i move and random directions or cant move the way i want

im using the gambatte emulator and blue

if anyone knows why this isnt working that would be helpful but im very new to speedrunning so i may just be doing something dumb

If you're not holding b, you need to hold b.