A common fan theory about the generation 1 games is that Team Rocket's actions were all
unified by the theme of trying to capture Mewtwo.
I cannot recall the details, but I recall that this theory hinges on Mr. Fuji and Dr. Fuji being the same person. What evidence supports this in the generation 1 games?
Note: I'm strictly concerned with evidence as it exists in the first generation games. I'm confident that some of the relevant signs, dialogues, and journals changed in the remakes.
In order to be certain that the information is from Gen 1, I strongly encourage answers to show pictures of the evidence that they're using. Any suspicion of translation issues should be backed up by the original Japanese.
I'd like to see the link between him and the unnamed author of the diaries. To be honest, I thought said author was named "Dr Fuji" even in Gen 1.