Hacked. I don't think there's a reliable way to get better than completely random IVs in HGSS in the wild, so getting a perfect IV Ditto that's also shiny has such incredibly low odds it's just not possible. There's no Shiny Charm in HGSS either, so just full odds. 1 in 8192 for shiny, and 1 in 1,073,741,824 for perfect IVs, so combined that's literally fewer than 1 in 8 trillion wild Ditto. Even if this person spent several lifetimes just hunting Ditto and doing nothing else he or she probably still wouldn't have found one like this. To illustrate just how ridiculous these odds are, HGSS sold about 12-13 million copies. If each and every one of those buyers got out and literally caught almost a million Ditto in their file, statistically only one of those players would actually get this one.I'm posting this here because I didn't see a thread like it for SwSh. This is the Pokémon:
Pokemon Species: Ditto
Pokemon Gender: N/A
Nickname: (Japanese katakana transliteration: metamoso)
OT: (Japanese katakana transliteration: zuki)
IV's: 6 best
Characteristic: It takes plenty of siestas!
Level Caught at: (unknown)
Current Level: 100
Stats: HP - 300, Attack (blue lettering) - 129, Defense - 144, Special Attack (red lettering) - 159, Special Defense - 144, Speed - 144
Location Caught: It seems to have traveled all the way across space and time to join me from the Johto region.
Date Met: (unknown)
Pokeball Caught In: Love Ball
Blue Pentagon? No origin mark
Any other notes?: I got it from a copy of Omega Ruby I bought in GameStop. I am pretty sure that the previous owner was a serious breeder because of the amount of eggs and Pokémon (including shinies) with Pokérus. They left multiple legendaries with varying IVs, some with multiples of those legendaries, including shiny Xernias and Yvetl that match perfectly the description of the ones from the 2016 event. From what I have gathered, it seems almost legit, but what throws me off is the lack of an origin mark. I'm confused about whether or not there could be a gen 2/remake pokemon without one. I'm trying to breed competitive Pokémon, but I don't want to use offspring of genned or hacked Pokémon.
And there are several indications that it's not from GSC, It lacks the GameBoy mark, it is in a Love Ball (while everything from Virtual Consoles comes in regular balls), pokémon from GSC virtual consoles can't go to ORAS, and the description also lists it's from the 'good old days' or something like that if it's from a virtual console game. If it were legit, it'd had to have come from HGSS.