While it's possible for some Pokemon to be missed by gamers who speed through a Pokemon title, Snorlax literally blocks the path and the player's progression in the original Gen 1 Pokemon games ...

Turns out the only thing harder than waking Snorlax up is defeating a Shadow Snorlax in battle. Currently, Shadow Snorlax is one of the hardest Shadow Pokémon available in Pokémon Go.