"Rather dark Easter egg in Let's Go (spoilers)"

I was walking through the Pokemon mansion. To be an asshole, I had my Mew out of it's ball in the basement. In my mind, "I'm sure Mew would love to see where they experimented on it!" In the basement is a giant holding chamber. When Mew gets near it, s/he runs over and it says, "Mew is starting quietly at the chamber." When you check on the chamber it says, "it's a large container made of thick glass. It looks as if something has been beating on it over and over from the inside." So, this confirms that that is where Mew was experimented on and where Mewtwo was born. via /r/pokemon https://ift.tt/2TxHPmj