Although Solosis are among the oldest pokemon on this world, and controversy remains as to whether or not they predate all multicellular life, science can not securely place this pokemon's genesis on Earth. Solosis, after all, are capable of surviving on this world's most extreme environments, and evidence from the outside of spacecraft suggests that even the vacuum of outer space is not enough to kill these creatures. For this reason, it is impossible to prove that these pokemon originated on our planet, for their cell structures differ dramatically from those found in most pokemon life, and a meteor, comet, or other celestial object could just as easily have brought them here from far beyond.
If this is indeed the case, however, then there are fundamental similarities in the makeup of their alien minds with our own, and perhaps with all life in the universe – for Solosis have little difficulty communicating with pokemon species on this world through telepathy. To be sure, this could be a derived skill from evolution, for Solosis lifespans are nothing against the eons of time which have passed since the Cambrian expansion – but the remarkable stability of these pokemon over time suggested by the fossil record makes it highly unlikely that they have evolved at all, save of course for turning into Duosion through age and experience.
However, the possibility that Solosis evolved in space should not be mistaken for proof of that fact, for our world hosts the origin of the vast majority of known pokemon. Even if Solosis originated here, however, these mysterious, highly divergent organisms remain highly useful for our understanding of the universe, simply because they are capable of surviving in the rest of it. Should humans ever colonize the galaxy, the genetics of Solosis shall teach them how.