[He puts his hands up, prepared to shield himself, and continues on gently.] Even if it was left alone for a moment, that does not mean it is yours.

[He pauses, gathering his thoughts and words. Of course, he does believe a Pokemon could raise an egg better than a human would, but...] Consider this: Do you know what Pokemon is inside that egg? Is it your own species? [Would a wild Pokemon even be willing to care for one of another species? N... isn't sure.]