[Other] Why is this happening to my sprites?

[BahamutZero]

Hello, I was wondering if anyone could tell me the cause of this error, my sprites don't have a outline!
I posted a picture in the description, if it is any help.
Thank you!

 

[PokéMew1]

Hello, I was wondering if anyone could tell me the cause of this error, my sprites don't have a outline!
I posted a picture in the description, if it is any help.
Thank you!

It could be because the black outline is the first color in your palette of 16, whereas the background color should be first. Switch them around, then try it out.