is not a version number. It is a memory offset (specifically, an overflow from the 0x477F region of the script table). In late 2011, a user known only as "EntropyRising" uploaded a 512kb patch file titled HG_4780_UX.ips to a now-defunct FTP server in Finland.
And the last line of the Readme file: "This is for the Johto of the mind. Outsiders, turn back." Do not attempt to merge the 4780 patch with the "Sacred Gold" or "Storm Silver" mods. The resulting hybrid locks the Nintendo DS firmware into a boot loop displaying the message: "Universal. Not anymore." 4780 pokemon heartgold uxenophobia
Specifically, the full trigger phrase is is not a version number
This article is an exhaustive investigation into the 4779 builds that preceded it, the flag, and why you should never, ever apply the 4780 patch to a legitimate Pokémon HeartGold ROM. The "4780" Build: What Is It? To understand the anomaly, we must first understand the numbering system of Pokémon HeartGold (Version HG/SS Engine RE). The official releases ended at v1.1 (the bug fix for the GTS). However, in the underground scene, "build numbers" refer to specific memory addresses in the ARM9 binary. And the last line of the Readme file: