quick sad-ish hc that leafeon upon first evolving from eevee have really light green leaves that become darker and more vibrant as adults. when they start becoming ‘mature’ per say, the leaves become gold or red or orange, and when they’re nearing the end of their lives, they become brittle and brown
also if you bury a dead leafeon and water the grave, eventually an egg will appear from the earth
What if flareon has vibrant colours and as they get older the colours get darker and they turn to ashes when they pass and that keeping the ashes warm spawns a new egg