Prof. Aspen is a creation of the earth, who coundn't bear the fact that some Pokémon were either getting badly treated by unworthy trainers, and some other pokes were getting seriously injured.
Prof Aspen's wife : Nurse Joy, decided to heal and take care of Pokémon ever after
Who is this mysterious man in a lab coat. What does he do with the pokemon he takes. Does he sell them to others or use them to perform illegal experiments. Why dies he want to buy pokes when he can catch them. Hmm.
Just a joke