Spontaneous generation?
In games, some Pokédex entries seem to indicate that some Pokémon may appear spontaneously in the world. For example, the description of Kadabra in the Pokémon Fire Red game describes: "They say that one morning, a boy who had extrasensory powers, woke up turned into Kadabra." This seems to indicate that some people might spontaneously turn into these creatures, although it is only a legend.
However, many Ghost-type Pokémon are described as souls of human beings or as inanimate objects that suddenly came to life. Yamask, Banette, and many others are examples of this. However, despite their origin, these creatures can still reproduce. Here the question arises that if, according to myth, Kadabra was ever a human, how did his pre-evolution Abra come about?
Raising Pokémon
From the Pokémon Gold and Silver game, the player could meet the so-called "Breeders", who could be entrusted with two Pokémon. If the player left two compatible Pokémon of the opposite sex (or almost any with a Ditto), you could be sure that at some point when you return you would receive an egg. "We don't know how it got here," the breeders will mention the young protagonist. This situation opens two possibilities, the first is that breeders try to make the young protagonist find out what sex is; while the second inferred that, indeed, the Pokémon reproduce in some way that does not imply contact.
And this is not something that is only present in the games, in the animated series, specifically in the first season, Ash Ketchum in a moving scene releases his Butterfree during his mating season, which he leaves with his partner to start a family .
Now, these types of relationships would be very different from what would be expected. Only certain "egg groups" are compatible with each other for breeding, indicating that their form of reproduction is incompatible with members of other groups. For example, humanoid creatures like Mr. Mime can spawn with a Magmortar, but a Magmortar cannot spawn with a flying Pokémon like Rowlet. In addition, parenting species and other traits of offspring depend on parental chromosomes, indicating that genetic traits mix through the reproductive process, just as in real life.
Genderless pokemon
Furthermore, many Pokémon are not based on real life animals. Creatures like Paras and Bellsprout are obviously plants, and plants reproduce very differently than animals. However, almost all of these creatures except for the legendary ones are capable of producing eggs. This indicates that, unlike plants that reproduce through fertilizing their seeds from mammals that are born in childbirth, all Pokémon are born from eggs.
In nature, eggs are produced by one member of the couple and fertilized by the other. The existence of the genre in the franchise world makes reproduction biologically logical. However, there are Pokémon that have no gender (and presumably neither sexual organ), so the situation becomes complicated again. Creatures like Voltorb cannot reproduce with another Voltorb. This means that they need another Pokémon that can change and adjust its gender to reproduce.
And here Ditto enters the scene, who can reproduce with any Pokémon since he can transform at a biological level in any other creature. If Pokémon were able to reproduce asexually, then Ditto's presence would not be necessary for Voltorb to procreate. However, the fact that you need it indicates that these creatures reproduce sexually. In conclusion, all Pokémon, including those that are genderless, require a sexual relationship to breed.
Source: CBR
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