How exactly are Pokemon classified as legendary, or even mythical? Pokemon like Palkia or Kyogre seem fairly obvious. Others like Entei or Zapdos don’t seem stronger or rarer than Pokemon like Garchomp. Locario populates Sinnoh history and myth even more than say, Manaphy. Even Rotom, Phione, and Zorua have seemed unclear at some points. And this isn’t even bringing up the complications of man-made Pokemon and genderless-ditto breeding. So in short, how are Pokemon classified as legends?
This is a wonderful question! There’s truly a large number of factors that go into determining the classification of Legendary and Mythical Pokémon, so I’ll do my best to cover the basics.
First and foremost (and the most obvious in my opinion) is the mythology of the species. Most Legendary Pokémon have an incredible amount of history surrounding them, dating back to ancient times. As you said, not all Legendary Pokémon are as widely-renowned as the likes of Rayquaza and Arceus, but in most cases there’s a deep history of their sightings dating centuries back. Yes—Lucario has been seen in myths more often than Pokémon like Manaphy, but that’s simply because Lucario’s history is deeply intertwined with mankind. Similar to Arcanine and other loyalty driven Pokémon. Believe it or not, Manaphy fossils date back further than some Relicanth fossils!
I know what you’re thinking—What about Pokémon like Genesect and Silvally, though? They aren’t ancient by any means and have only been brought into existence in recent years. This is also true! We categorize them as Legendary/Mythical because... they don’t quite fit into any other category! They’re so new to the scene we don’t know for sure what they’re capable of and what effects they have on their respective environments. Until we have concrete proof and enough study to make a fairer judgement, they’ll be staying on the list.
Lastly, most Legendary Pokémon cannot breed through regular means or evolve. Manaphy can produce eggs, but the eggs will always hatch into Phione—never a new Manaphy. The only true exception to this is Cosmog/Cosmoem and Lunala/Solgaleo. An argument can be made in the case of Type:Null, but it’s relatively agreed upon that Type:Null seems to undergo a permanent form change (simply a voluntary removal of the control mask) rather than an evolution when becoming Silvally.
Pokémon like Garchomp and Metagross barely miss making the list. Their high stat totals put them in the runnings for powerful Pokémon capable of giving some Legendaries a run for their money, but ultimately they fall short due to their breeding and evolution process and relatively shorter history.
This was quite a bit of information, and I hope I explained clearly! Thank you for your question, and if you have any further questions feel free to send a follow up!
—Professor Cherry














