Is the English Pokemon theme song more well known than the Japanese version? I was watching this video of the Japanese-YouTuber Hikakin beatboxing the first English Pokemon song. It made me wonder: was the English dub theme song more well-known than the original Japanese opening?
The following answer is based on the results I got on Google [from my country (France)].

Keeping the following elements in mind, one can say that their popularity level is more or less the same.
The comparison is made between the first Japanse theme めざせポケモンマスター (Aim to be a Pokemon Master) and the first English theme &quot;Gotta catch them all.&quot; I take into account only the official versions.
Google Trends


In red : the English, in blue : the Japanese


Except for the year 2005, the search trends looks to be pretty similar.
Surprisingly enough, the countries which searched the English opening on google were the following ones :



For the Japanese opening, the searches come only from Japan.




Youtube
The most viewed youtube video of the Japanese opening (in my country) views ~1 million views.
The most viewed youtube video of the English opening (in my country) views ~1 million views