>>32330649Normal type represents a special case where the recipient organism represents the idea of perseverance and hard work, which is why most Normal types are animals or humanoids. Humans and things like them tend to represent the "idea" of overcoming or mastering the environment around them. Most of the animal Pokemon to represent this idea are similar to some degree: Bibarel build damns, Tauros are alpha-males which lead and build their herd, and Rattata infest and populate in fields, forests, cities, and damn near any environment they find themselves in.
Humans are an anomaly in which a non-pokemon species achieved sentience and the ability to generate new ideas. This is why new types will occasionally appear, as when human mythology and folklore generated the "idea" of a Fairy-type, and why suddenly previously Normal-type pokemon became Fairy. There were similar events prior to the games for Fighting and Psychic types, which didn't exist until humans did.
Humans will also occasionally become Pokemon, which accounts for several of the humanoid species; once this happens, that individual is the first of a new Pokemon species. The most famous example of this is the Abra line, though similar cases exist for Jynx, Machop, Ralts, etc.
