Glitches

Any Pokémon with an abnormality resulting from programming in the game, rather than hacking.

Evolution Jump
In an earlier version of the game, right after the x2 speed button was added, there was a glitch where that Pokémon would evolve two spots higher up the pokedex instead of one when x2 speed was turned on. For example; a Dratini would evolve into a Dragonite instead of a Dragonair at level 30 and a Magnemite would evolve into a Farfetch'd. Because the glitch is gone, higher evolutions that are a lower level than they should be are rare, such as level 17 Charizard.

Nasty Plot
Another type of Glitch Pokémon is Nasty Plot Growlithe and Arcanine, where Growlithe and Arcanine could learn Nasty Plot in an earlier version. Again, this was fixed later, so these are rare.

Shadow Mew
Recently, anybody who obtained a Shadow Mew right after Shadow Pokemon first became available, were surprised to find that their new Pokémon was glitchy. In the Pokemon Center, it appeared normally and as it should have. However, its sprite in the boxes was that of a regular Bulbasaur and its sprite when battling was of a Shiny Mew instead of a Shadow Mew. When emailed, Sam claimed that he would fix it in the next update.


 * update* Sam has since fixed this glitch, and all shadow mews are as they should be.

Game Corner
On January 30, 2012, There was a glitch where you could get shadow pokemon without spending any Casino Coins. The shadow pokemon would not go into the recieve your pokemon, so you couldn't get unlimited shadow's. This is currently fixed.