“Gotta catch ’em all” used to mean 150 Pokémon, but that number has recently been revealed to be 151. Like many of us you were probably not able to attend one of the Nintendo events to acquire the rarest Pokémon of all, Mew. Luckily, there is a glitch in the game that allows us to complete our Pokédexes.
The bad news is, if you have already beaten the game, you will most likely have to start over. This is because there two trainers that must be unbeaten for this glitch to work. First is the Youngster with the level 17 Slowpoke on Route 25. He is the fourth trainer after you cross Nugget Bridge on the road to Bill’s house. Second is the Gambler with two Poliwags and a Poliwhirl on Route 8 between Lavender Town and Saffron City.