>>34236853 Gen 1: realistic details, generic anime eyes, generic designs in general, realistic proportions
Gen 2: details are mostly just stripes, generic anime eyes, somewhat generic designs, simplified geometric shapes, evos tend to have realistic proportions but preevos and base forms tend to have head bigger than the body.
Gen 3: details are often just a body part being a different color than another, various types of eyes, generic designs, geometric simplified shapes, chibi proportions that evolve into realistic ones.
Gen 4: details consist of various kinds of patterns on the bodies, various types of eyes, generic designs, geometric shapes, chibi proportions evolve into realistic ones.
Gen 5: various kinds of patterns, various types of eyes, genericish designs, geometric and semi-geometric simple shapes, chibi proportions evolve to realistic ones.
Gen 6: patterns like in gen 3, various kinds of eyes, generic designs, geometric simple shapes, chibi evolve into realistic.
Gen 7: various kinds of patterns, various kinds of eyes, generic designs, geometric and simple, chibi evolve into realistic.
Gen 2 is the missing link.