Regional compatibility of the Shiny Sinnoh Trio events in Pokémon Black 2 (Japanese cartridge)

[Diegoxyz]

Hello, I would like to ask a question regarding the Shiny Sinnoh Legendary Trio events. I recently obtained a Japanese Pokémon Black 2 cartridge, and I was interested in injecting the official event. However, while researching, I came across information stating that this event was not distributed in Japan.
In Generation 6, there were some Japanese events that could be redeemed on cartridges from other regions, so I wanted to know if this was also the case for the Shiny Sinnoh Legendary events. If so, in which language was the event distributed?

[ICanSnake]

Gen 5 games could only redeem events that were compatible with the language and region of the cartridge. Which means that some events were locked to only be redeemable in certain languages. Japan never got that distribution, so it can't directly be obtained in a Japanese game.

Here are all the languages the Dialga/Palkia/Giratina were released in:

08193 SUM2013 = English distributed in the US

08303 SUM2013 = English distributed in Europe and all other locations

08303 VER2013 = Spanish

08303 EST2013 = Italian

08303 ÉTÉ2013 = French

08303 SOM2013 = German

09143 10/12 = Korean

For events distributed in gen 6, the wondercards were changed so that they were redeemable based on the region of your 3DS console and the language you set for your game. The region you bought the game in doesn't matter.