I created a topic containing all the tutorials I created on how to create custom themes, this topic will serve to post updates and discussions regarding the creation of customized themes. You can ask your questions related to creating customized themes. The link is available below.
https://gbatemp.net/threads/tutoria...e-quality-of-official-nintendo-themes.460823/
https://gbatemp.net/threads/tutoria...e-quality-of-official-nintendo-themes.460823/