An Attempt at Analyzing Life-Spans of Pokemon...
Where did Red's Pikachu come into this? >.>
100 Years.. I don't know why, I just think they live for a long time.. could be infinate :P
Coincidentally enough, that's roughly amount of time that the Emerald PokeDex identifies of Absol's life-span:
Emerald Pokedex Entry - Absol said:
It sharply senses even subtle changes in the sky and the land to predict natural disasters. It is a long-lived Pokémon that has a life-span of 100 years.
HeartGold/SoulSilver Pokedex Entry - Absol said:
It has the ability to foretell natural disasters. Its life span is over a hundred years.
I would say that life-span is dependent on the Pokemon in question, though Pokemon in general tend to be long-lived, it appears. They are susceptible to the elements and natural causes just like humans, but are more resilient due to their inherent magical abilities having been bestowed upon them for ages. However, enigmatic quirks such as Ghost-type Pokemon, data-based Pokemon, and PC storage disrupt any overall estimations.
I would assume that Pokemon PC Storage, as well as conventional Poke Ball storage, renders Pokemon in a form of stasis - similar to suspended animation, if you will. Poke Balls are noted for provided captured Pokemon with habitats suitable to their liking. The "wallpapers" in the PC Storage System could also be related to the habitat creation that occurs inside Poke Balls (due to the various elemental-themed backgrounds, such as caves, lakes, urban environments, and grassy terrain), ensuring sustenance for all Pokemon contained within the Box. Such could probably extend the life of a Pokemon indefinitely, should such a system executed properly.
However, by being exposed to nature, a Pokemon's life cycle presumably proceeds as normal. The period could be reasonably longer than a human's life-span, provided that the Pokemon is of optimal condition and unaffected by any adverse factors or illness. Seeing as many Pokemon have adapted to particular elements, their longevity probably far exceeds that of humans, yet still remains in a finite value.
The Porygon line is notorious for its ability to revert to data. I would hypothesize that as long as the media that Porygon is contained in does not deteriorate or decay, Porygon should live for quite the lengthy amount of time. It's like data in the real world: as long as the metallic components and stuff in your USB is in proper working condition, you should be able to access your data with ease. However, should the USB be destroyed whether due to physical damage, trauma, elemental disruption such as water or electrical discharge, etc., the data is lost as well. A cyberspace environment would probably benefit the Porygon line much better than a natural setting would, provided that Porygon can sustain itself and that Porygon's "host" media (i.e., a computer) does not encounter or suffer damage.
I'm not sure on other types of Pokemon, but I think that Ghost Pokemon can live forever.
This
might be plausible, but Ghost Pokemon are just weird like that, LOL. I guess certain Ghost-types only retain ghostlike
properties without being true ghosts, while certain Pokemon are more in line with reincarnations of people of past eras, which is a bit weird as I reflect on it... But there
does seem to be some sort of great, distinctive difference between Ghost-types like Gengar, and literal Ghosts like the Marowak killed by Team Rocket in Pokemon Tower. It's weird...both types of Ghosts are susceptible to elemental moves and techniques, yet literal Ghosts can avoid capture by a Poke Ball. Maybe it has something to do with the Poke Ball's energy conversion...literal ghosts
have no energy to convert, while Gengar and the like do. As for Ghost-type Pokemon, even
they are prone to being afflicted by entry hazards, weather conditions, and other field moves, so they have a definite life-span as well, it seems... I'm guessing Ghost Pokemon have the highest resiliency of all Pokemon, so while they can live eons upon eons in a manner possibly similar to legendary Pokemon, they cannot escape the cruel fate of death either... As long as they possess "energy" and are catchable via Poke Ball, they have a life-span just like all other Pokemon do.
Sigh...I guess life-spans are just one of the more cryptic aspects of the Pokemon universe, just like a myriad of other things. XD