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Wikipedia on Electric Soldier Porygon:

The anime technique "paka paka" uses different-colored lights flashing alternatively to cause a sense of tension.
The anime technique "flash" emits a strong beam of light.

TVTropes: MissingEpisode: Anime And Manga: On Electric Soldier Porygon:

In fact, anime had been like this for years and it wasn't until the Porygon episode that this kind of thing stopped.

It makes sense that those techniques weren't new to the industry, but now I'm wondering if they had ever been reported to have caused photoepileptic seizures too?

Other than YAT Anshin! Uchū Ryokō's incident earlier, in March of the same year, 1997.

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  • Preliminary research on Japanese Wikipedia mentioned that Square's Final Fantasy V also induced the same seizure in 1992, but I haven't searched further if it made news or not.
    – Aki Tanaka
    Commented Apr 11 at 16:03

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In Japan, the answer seems no. This Wikipedia article mentions, in connection with YAT Anshin Uchu Ryoko (broadcasted by NHK), NHK apologized that sufficient investigation on the incident by YAT Anshin Uchu Ryoko could have prevented Pokemon Shock.

According to this BBC article, there was a similar incident with a TV commercial in 1993, which was banned.

This wiki article lists some animes prior to Pokemon that use the same visual effect, and there seem to have been some reports of PSE, but they are much lesser-known and there were fewer victims. Thus most probably the incidents weren't widely known.

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