Ok I know your probably like ";-; Delta wth is oscillation and why should I care", well that exactly how I felt when I first found out about it. Not really sure how to explain what is is, but oscillation in earthbound is what makes the backgrounds look all wibbly wobbly like somebody threw jello with a weird texture onto your screen. The method I used to achieve this in scratch was inspired by this image: https://media1.giphy.com/media/v1.Y2lkPTc5MGI3NjExMmpsNnRsbzZrNjgzZXZtbHJ0dHZ4bW02Z2p1dGg4dGY2M3d4czNweiZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/uE1FB4N9KDkAM/giphy.gif Not sure how I got this to work based on an image and literally no code to go based off of, but I did. If you want to have a go at making earthbound backgrounds with this than be my guest but... yeah it might be kind of hard as this is scratch ;-;.
Thanks to google for giving me thousands of images of "Circle Oscillation", and giving me zero explanation for what is actually is whatsoever. Hooray for lack of knowledge! #ihavenoideawhatimdoing:D Setting the speed to 100 is the definition of ADHD.