With that script call, you can change the opacity of the picture, without using the game show/move pictures.
But to do the slow fade in/out you have to do a bit more eventing. Maybe use a variable to keep track of the time you want to the fade happen.
Like variable duration = 60;
$gameScreen.picture(id)._opacity -= (255/duration);
if(duration <=0) break loop
Something like that, I'm not entirely sure about the math here xD
But maybe you can find your way out
um... why didn't anyone tell how easy it is to add motions to Sideview battlers? I literally copied the last one, changed the name and index, said where it should play, and boom... I've got intro motions.
Lately when I listen to 1970s songs, I always think that the "real world" is still at mid 70s. What we experience now is a futuristic dream. With this point of view, even 80s and 90s looks super futuristic.