This Easter, a Pokémon fans comic explained the inherent strangeness of Pokémon eggs. The breeding mechanic was first introduced in Pokémon Generation 2 and quickly became a mainstay of the franchise, being implemented even in spin-offs like Pokémon Masters.
Logically speaking, the fact that all Pokémon lay eggs is a little absurd. Those that resemble fish, birds, and insects are understandable, but the mammalian Pokémon species lay eggs as well, in addition to the esoteric Ghost-types and more besides. The fact that players can get an egg from Pallosand, a possessed sandcastle, can be a little hard to swallow in that regard. So the ubiquitousness of eggs is rather odd in terms of worldbuilding, although understandable from a gameplay perspective. Eggs allow for consistency, and hatching them requires an investment in time and energy from players, increasing playtime. This is true in both the mainline games, where you can be reasonably certain of the outcomes of breeding, and other games like Pokémon GO, which leaves the contents of its eggs mostly up to chance (albeit with the pool of possibilities and hatch rates available for trainers to view).
With all that to consider, it isn't surprising that fans can and will poke fun at the concept on occasion. One fan artist on Instagram, known as katalystcomics, wished fans a happy Easter with an appropriately egg-themed comic. Due to Pokémon's breeding mechanics being based around the concept of Egg Groups, which denote which Pokémon can breed together, it is entirely possible to breed Wailord, a Pokémon over 14 meters (or around 47 feet) tall, with Diglett, which generally stands at a grand total of 20cm (8 inches). The resultant Diglett-sized egg can then hatch into a 2-meter (6'7") Wailmer. The somewhat snarky take is not the first time that this artist has made fun of Pokémon's breeding mechanics and has earned the Pokémon community's stamp of approval.
The entirely canonical sizes involved in katalystcomic's latest work are both funny and ridiculous, a pattern which can be seen repeated with a multitude of potential breeding pairs from throughout the franchise. There is, for example, a classic fandom joke which pairs Wailord with Skitty, another diminutive Pokémon like Diglett, to highlight the potential size disparity. This is possible due to all three being part of the Field Egg group. At least in the unique case of Ditto, which can breed with almost any Pokémon, its shapeshifting ability presumably helps to ease the problem- but then again, Dittos have other breeding issues to be concerned about.
Pokémon breeding is a core gameplay mechanic which allows players to breed stronger than normal Pokémon for a competitive edge, in addition to helping trainers on the hunt for elusive shiny Pokémon. Some Pokémon can produce eggs in spite of having wildly different biology, and the resulting children can then be bigger than their eggs could realistically ever hope to contain. At the end of the day, it is simply a game mechanic and a useful one at that. And not all Pokémon mechanics related to breeding are so unbelievable, either. For instance, some Fire-types can have Abilities that speed up the hatching process, something that can be likened to a form of incubation. But at the same time, from an in-universe perspective, the practical applications can be a strange and amusing prospect.
Source: katalystcomics/Instagram