With all the new innovations in the Pokemon universe, we come to understand some of the natures of these strange pocket monsters.
Voltorb has been present since generation one. How did this Pokemon come to be? Well, the best way to explain this would be by telling you the truth about the six to a team rule. If you had seven or more Pokemon, they would become eventually become Voltorbs.
The bulb on a Bulbasaur's back forms a symbiotic relationship. A Bulbasaur can't survive without it and it cannot survive without its host. As this Pokemon evolves, the bulb takes over more and more, much like with paras when it evolves in to parasect.
One of the cuter Pokemon is Pollywag as a tadpole that has a voracious appetite not unlike that of Munchlax. This is where the trouble starts. Children who keep this Pokemon as a pet may find themselves becoming food if they aren't well fed.
Grimer a very interesting Pokemon, much like in this current generation where we have a wishy-washy. Both of these Pokemon are made of several smaller wishy-washy in its schooling form, of course. The bacteria that makes up Grimer forms around areas of trash. Koffing, like Grimer, also uses bacteria, but unlike Grimer, has its own body. This Pokemon splits to reproduce and its evolution wheezing is the result of a common failed separation of parent and child.