Bulbasaur Evolution

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Bulbasaur
For some time after its birth, it grows by gaining nourishment from the seed on its back.
Bulbasaur is a reptilian creature that somewhat resembles a toad or a young dinosaur with a spotted blue-green hide. Its eyes are a bright red, but the most notable feature of this Pokémon is the onion-like bulb on its back. This bulb has a symbiotic relationship with the Pokémon, growing from a seed planted on its back by its mother at birth.
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Ivysaur
When the bud on its back starts swelling, a sweet aroma wafts to indicate the flower's coming bloom.
Ivysaur, like its pre-evolved form Bulbasaur, resembles a toad or a dinosaur, though the patches in its skin cause it to more closely resemble a dinosaur. After evolving from Bulbasaur, Ivysaur grows small fangs, and has visible ear insides and pupils. Ivysaur's skin is also a little bit more blue than Bulbasaur's. The most notable difference in Ivysaur's appearance however, is that its bulb has changed into a pink flower bud with leaves extending
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Venusaur
After a rainy day, the flower on its back smells stronger. The scent attracts other Pokémon.
Venusaur is considerably larger and heavier than both of its pre-evolutions, and as such it moves slower than the two. The bud on its back has since bloomed into a large red flower with six expansive, white-spotted petals, supported on a brown trunk somewhat like that of a palm tree. Instead of patches on its skin, Venusaur appears to have frog-like warts. Additonally, Venusaur’s ear insides now appear to be red in coloration.
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All my info taken from Bulbpedia