raichu- Yes the episode Sparks fly for Magnemite in S1 (Or S2 don't remeber exactly).
I am not really sure, I guess they are living things since they can move and have moods. I think somewhere it explains how a Voltorb came to be in a Pokedex entry but I don't know where. Porygon and its evolution are manmade as well, and apparently Banette came from forgotten dolls (Which I don't think makes much sense, how can it evovle from Shuppet if it's from a doll)
Hmmm very good question, I'm stumped. But most of the things in the pokemon world don't make sense and I accept that because I don't want to go crazy trying to make sense of it all.
I dont know dude just leave it to tajiri
Wasn't there an episode where Ash thought a magnemite liked pikachu but all it liked was the electric static?