I'm still having some trouble with the sprites, I downloaded the front and back of a Feraligatr and did as you said, I renamed them to 160s and 160sb. I first tried putting them in the Battlers folder with the original 160 png still in the folder but there was no change in game. I also tried removing the original 160 png and renaming the new front sprite to 160 and the back sprite to 160b, but that failed and the feraligatr ended up with nothing as a sprite. I also tried it with the mega garchomp sprite you made. I did the same thing and put the front and back sprites labeled 445s_1 and 445sb_1 respectively. I kept the original 445 png in the folder but when I mega evolved the garchomp, the design wasn't changed. I feel like I should be modifying the original pngs, just swapping the original mega garchomp sprites with your sprites. What am I doing wrong?