Have you seen "4780" appear in your copy of HeartGold? Let us know on the forums—but don't hold your breath for Null-Grass.
According to a creepypasta from 2016, if you name your rival "4780" and then defeat the Elite Four exactly 47 times without saving, the game will glitch and allow you to surf in Ilex Forest. There, you would encounter a level 80 "shadow" form of Celebi called pokemon heartgold 4780
At first glance, it looks like a simple typo or a stock number. But dig a little deeper, and you’ll find that this combination of words and numbers has sparked a small but dedicated following. What does "4780" actually mean? Is it a rare find, a pricing code, or something else entirely? Have you seen "4780" appear in your copy of HeartGold
Others claim that "4780" is a leftover debug value used by Game Freak to test the connectivity. The theory goes that if the Pokéwalker detects exactly 4,780 steps, a hidden "Glittering Cave" path unlocks. Verdict: This is almost certainly a hoax. No credible datamine of HeartGold has ever found this value. Theory 3: The "MissingNo." Successor (Fan Myth) Where there are Pokémon fans, there are urban legends. Every generation of games has its mythical creature. For Gen II remakes, "4780" has become a whispered ghost. There, you would encounter a level 80 "shadow"