How long have legendaries had 3 perfect IVs upon catching them?

Question

I have never been told this and only recently learned it; I was surprised by what excellent IVs my legends had...how lucky I thought I was to catch a Regirock with 3 perfect ivs and a nearly perfect in Attack xD and a Premier Ball on the first try.... but that's irrelevant,

I suppose it's only fair they implemented this, but seriously how long have they done this?

Answer 1

They started giving the legendaries 3 perfect IVs in X and Y. There's also a chance that they increased the odds of getting more than 3 perfect IVs as well.

Fun fact: Special Pokemon such as the Cosplay Pikachu also have 3 perfect IVs.

Source: Experience and legendaries from gen 5 and below not having any perfect IVs

Comments

That would be why. I do not have either, OR was my first Gen VI game

Also I never tested my Gen V Pokemon...

---

Actually, any Pokemon that cannot breed is garunteed to have 3 perfect IVs, including Legendaries.

---

Actually, any Pokémon in the Undiscovered egg group has 3 perfect IVs

---

Does that include babies?

---

Bulbapedia says no; it applies only to to Legendary Pokémon, Mythical Pokémon, and Ultra Beasts, except when in X and Y, there are some I'd be interested in looking at:

Nidorina, Togepi, Tyrogue, Smoochum, Azurill, Chingling, Mime Jr., Riolu, and Mantyke all appear in those games in the wild, so I wonder if those all appear with 3 perfect IVs too. I've never owned the game and it would really shock me if that were true. Bulbapedia implies this was once a thing and was amended.
https://bulbapedia.bulbagarden.net/wiki/No_Eggs_Discovered_(Egg_Group)