yea, its called HEX EDITORS and TILEMOLESETER and TILEVIEWER and MEMORYVIEWER.
perhaps you have mistaken me for one of those who can only use tools but I'm not that way, I know how to use hex editor and I know that you need to know ASM to insert compressed images in RBY. that's why I have asked if there is a code for automating the process of image compression in RBY..
Do you know a way (other than ASM) to put a chikorita sprite in pokemon blue version?
P.S.: all I know, or think to know, is that the compression algorithm should be similar to LZ77