Shortly after the game's release, a screenshot started circulating online depicting the Seagallop ferryman in Vermilion City telling the player: "By the way: if you like this game, buy it or die." Those who posted the screenshot claimed that it was a hidden message which was only triggered if the game detected that it was running a pirated copy. This claim appeared to be further corroborated by people claiming that they had encountered the message themselves when playing the game with unofficial Game Boy Advance emulators or when hacking legitimate cartridges with cheat devices, and attracted further popularity after being disseminated by various gaming YouTubers.

However, while the screenshot was not photoshopped, the claim that it was an anti-piracy measure was not true. Rather, the text was added into the game's code by an anonymous individual who distributed a ROM of it online; the claim that it was an anti-piracy feature was most likely used by the individual to circumvent ROM distribution sites' restrictions on modified games. This explains why anecdotal reports of encountering the text were so much higher than what would be expected from a complete hoax, as well as why the text is absent when examining an unaltered ROM of the game in a hex editor.