- Location
- USA
- Pronouns
- He/Him
As far as Naruto lore is concerned, it was at least available enough by the time of the Third Shinobi World War for a Rock ninja to be skilled enough to create 20 Shadow Clones. Mizuki was trying to collect the Scroll of Seals, which contains many techniques, including the Multiple Shadow Clone technique (a forbidden variation of the normal Shadow Clone technique due to the vast amounts of chakra needed for the volume of Shadow Clones) and Uzumaki Clan's Eight Trigrams Sealing Style (a foundation of techniques like the Shiki Fūjin, and possibly a hiden, as both the First and the Fourth Hokage might be considered Uzumaki by marriage and it appears to be secret otherwise).
The Sealed Scroll has the Mass Shadow Clone Techinque, which is a kinjutsu because the chakra division kills most ninja. This is why Naruto's first combat use of Shadow Clone is Mass Shadow Clone Technique.
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You guys are the GMs and can rule otherwise, but as dwibby mentions above, this is fanon. The version of Shadow Clone which is a kinjutsu is Mass Shadow Clone Technique; other countries do have Shadow Clones in canon.
I sit corrected. SC itself is not a forbidden technique, MSC is. Still, in this game SC is a technique restricted to Konoha, at least at this point in time. OOC: there may be a few high-end people who know it, but none of you have heard of it.