This event is one out of two new Mega Evolving Pokemon distributed, Glalie International and Steelix Japan 3DS,
that is distributed to players for playing the Pokemon Omega Ruby and Alpha Sapphire Special Demo Version.
In the Special Demo, the Pokemon is encountered in a battle, with it's stats, nature, ability, and gender, fully randomized, as per any battle,
with the exception of it's Species, Level, and that it cannot be Shiny, being preset.
After capture, it can be nicknamed, and then can it be sent as a gift to the full versions of Pokemon Omega Ruby and Alpha Sapphire.
The language of the event is determined by the language of game save of the Special Demo Version,
so it's possible to receive a Pokemon with different Language of Origin from the save of the full versions of the game.
However, this Steelix can only be have Japanese as it's Language of Origin,
as only Japanese 3DS Special Demo Version can encounter this Steelix,
and the Special Demo Version for the Japanese Region does not have the language selection screen at the start of the Demo.
Even when not nicknamed in the Special Demo, this Pokemon will have it's Nickname Flag checked,
as long as the name it currently has is different from the default name of the species of the receiving game save's language.
The Trainer ID is randomly generated and assigned when starting the Special Demo,
and the Original Trainer will be Orlando ENG, FRE, GER, ITA, SPA or オメガ JPN or 오메가 KOR.
^ OT name languages refers to language of Special Demo, not Full versions.
Below shows the exact details of the contributed .PL6 and .PK6 file:
Format Ver.2.1.2-2, Post Updated Date:20210823_1625
(The details were converted into a simulated file, which that file was then used as a HTML)