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Here are some evolution based ones
>Politoed turns green because the gems of a King's Rock are green(I know King's Rock doesn't even have gems but I imagine it could)
>Tangela evolves into Tangrowth because it's made of rocks undre the vines and it fuses more rocks to itself when it evolves and becomes bigger
>When Igglybuff evolves, the left and right balls on its head become Jigglypuff's ears and the middle one fuses with the swirl pattern to become Jigglypuff's curl
I'm sorry you had to read such high powered autism.