"I battled a Mew and it deleted my save file" almost sounds like a creepypasta and yet, it is completely real. Welcome to the wild world of PokémonRed and Blue glitches, where terrifying corruptions are possible.
Fun fact: The concept art for the Pokemon Red and Blue games showcased a female character that never actually made it into the final game. Actually, gender options for the main character didn't appear until Pokemon Crystal, in 2001.
It's easy to dismiss Professor Oak as a doofy academic who can't even remember his grandson's name. But, originally, PokémonRed & Blue designed Professor Oak as a powerful trainer the player could face off sometime near the end of the game.