Pokémon Red Blue Yellow Mew
Mew appears in Pokémon Red The Pokémon Company

Pokémon is currently celebrating its 20th anniversary and part of those celebrations saw the franchise's first generation of games, Pokémon Red, Blue and Yellow, re-released on the Nintendo 3DS virtual console. The venerable trio may not have the advanced features of Pokémon X and Y, or the newly announced Pokémon Sun and Moon, but there can be no question that they firmly cemented the series's place in the cultural zeitgeist of the past two decades.

For those readers not quite old enough to remember the heady days of Pokémon Red, Blue and Yellow (as well as the horrific rise of Limp Bizkit, bullet-dodging in The Matrix and the fear of annihilation from the Y2K "bug"), the games were an insane mixture of chiptunes, barely legible 8-bit sprites and the out-there concept of a world where the socio-political and cultural ideology is defined by the act of making pretend animals beat the ever-loving stuffing out of each other. It was amazing.

As Pokéfans get back into these games, we thought we'd put together a guide to two of their most noted glitches. One that allows you to catch the legendary 151st Pokémon Mew (and so complete the Pokédex) and another which duplicates certain items, which can be very useful for catching other Legendaries. Amazingly, they're still present in the 3DS versions.

The Mew Glitch

Mew Pokemon Glitch
Missed the Mew giveaway in February? You can still catch the elusive psychic-type Pokémon The Pokémon Company

There are several variations of this glitch, but the most popular and commonly used version will be presented here, but first a little bit of housekeeping.

The Mew glitch is only possible after you have beaten Lt Surge in the Vermillion City Gym and obtained the Hidden Machine HM02 Fly (located on Route 16 on the northern half of the route, inside a house accessible after using HM01 Cut on a tiny tree and shifting the Snorlax blocking your way). Grab a Flying-type from Bill's computer and teach it to Fly (the logic is baffling) and you are set to catch Mew with the following steps:

If you have already fought either of these two NPCs in battle, there are alternative methods. However, this is the easiest and most commonly used way to catch a Mew of your very own.

The MissingNo Glitch

MissingNo Pokemon Glitch Guide
Persist and you will meet the legend that is MissingNo Screenshot

While the Mew glitch did not become public knowledge until years after the original releases of Pokémon Red and Blue versions, the MissingNo glitch was notorious in its day, so much so that it even has its own meme.

MissingNo even got a customer service entry on an official Nintendo support page:

In short, unless you are the experimental type, we recommend you do not catch MissingNo. So, what is the point of this glitched-out Pokémon?

For most players, MissingNo was the gateway into the world of item duplication, a land of infinite Master Balls, Technical Machines and Rare Candies that essentially bent Kanto to the player's will as you caught any Pokémon with ease and had a party of level 100 behemoths. Like the Mew glitch, item duplication is present in the virtual console releases of Pokémon Red and Blue but not Yellow. Sorry Yellow fans, while there is a way of cheating the system, it requires a lot of work and goes beyond a few simple instructions.

Red and Blue owner? Stick a Pokémon that knows Fly and another that knows Surf (HM03) in your party and follow these steps:

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