The distribution of Pokémon in Pokémon Go varies for every player; Pokémon supposedly populate each region that has the game based on geographic features. But some Pokémon are rarer than others, with a handful of monsters still eluding players. These rare and legendary creatures are said to be in the game, despite no one having discovered them in the wild yet.

According to a chart compiled by fans on Reddit, the top six toughest finds in Pokémon Go are Mew, Mewtwo, Moltres, Zapdos, Articuno and Ditto. No one has spotted these Pokémon thus far in-game, leading many to wonder if they're even obtainable through natural methods. A fan who shared what he said is Pokémon Go's code found data files for each of the six Pokémon currently missing-in-action, however, suggesting they are available within the game.

So why are these monsters so rare? Most of this list checks out; in the Pokémon games, Mewtwo and each legendary bird are only found in specific locations, while Mew is historically one of the hardest monsters to locate and catch. As for Ditto, however, although the normal-type isn't classified as a legendary, it can be tough to find in many of the traditional games. That's due in part to its unique breeding abilities; the Pokémon can mimic and breed with nearly any other to reproduce Pokémon.

As for where to find them, it's still impossible to say. Pokémon Go requires players to travel around the world in order to find all of its hidden monsters and secrets, and with the game still not out in Japan, among other places, fans may have to continue searching for a long time before finding any of these rarities. Ripley's Believe It Or Not is hosting a contest for players' coolest finds, so perhaps the allure of $5,000 could tempt these unseen Pokémon out of hiding.

Players are advised to stay both vigilant and safe on the quest for all 151 original Pokémon. If a Ditto spawns in the middle of Central Park, expect a stampede to form, as it did when Vaporeon appeared there last week. We've got tips on how to catch these tricky monsters once you do stumble upon them, along with even more info in our Pokémon Go guide.

Correction: There are six especially rare Pokémon, not five. We've corrected the text above.

Our Pokémon Go PokéStop Your source for all things Pokémon Go CLICK TO CATCH ALL THE POKÉMON GO NEWS

Pokémon GO Explainer