Personaly, I despise how shiny Ponyta goes from a very striking blue to a dull grey when it evolves into Rapidash. Pokemon Go got this right and updated its sprite to be more blue. I have a shiny Ponyta in Insurgence and evolved it, and I was so disappointed by the ugly sprite that I created an alt palette based on Ponyta’s fire (but with red eyes). I figured I’d share the full set of images in case anyone else would like a better shiny Rapidash sprite in their own game. Feel free to use! (Edit: Fixed a stray pixel on the tail, should be good now)
To use, simply rename the files to replace the corresponding ones in your Insurgence Graphics folder (look in Battlers, Icons, Characters)