Manga move errors
In the Pokémon manga, a situation will sometimes occur in which a Pokémon knows a move it cannot learn legally in any of the games. It is unknown whether these are actual mistakes, a writing policy of not having to stick to the games too closely, or merely the Pokémon using an attribute that shares the name of a move in the games.
Occasionally, in-game event Pokémon that can be transferred onto the main series games have a move that is not normally included in that Pokémon's moveset (a prime example being Pokémon Box Ruby & Sapphire, which gave away four separate Pokémon with moves that were not normally available to that specific Pokémon).
List of manga Pokémon with moves that they cannot learn in the games
|Y's Fletchy||Ember||Fast-Thinking Froakie||Y told her Fletchy to use Ember, but the move was never seen being executed. However, Fletchling is unable to learn Ember before evolving into Fletchinder.|
|Hau's Popplio||Bubble||The Delivery of Rotom and the Girl||Professor Kukui mentioned that his Popplio used Bubble. However, Popplio is unable to learn the move.|
|Gold's Pidgey||Peck||The Legendary Pokémon Appears!|
|Gold's Bayleef||Stomp||Extreme Power!! The Friday Pokémon|
|Satoshi's Charmander||Tackle||Prologue: Pallet Town|
Pokémon in How I Became a Pokémon Card will often use moves that they cannot learn in the games. However, this is because this series is based on the Pokémon Trading Card Game, so the "illegal" moves Pokémon use in this series are moves from their TCG cards.
|Blaine's Arcanine||Fire Spin||Cinnabar Island||Blaine's Arcanine uses Fire Spin in the chapter. However, Arcanine was unable to learn Fire Spin until Generation II.|
Similar examples that are not manga move errors
Pokémon which can know the move in a previous game
|Ash's Charizard||Dragon Breath||Off To The Battle Frontier!!||Ash's Charizard uses Dragon Breath, which though impossible for Charizard to have in Generation III onward, was available to teach to Charizard by TM24 in Generation II.|
|Gengar||Double-Edge||Tears and Emotions - It's the Final Chapter!||Gengar uses Double-Edge, which though impossible for Gengar to have in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team, was available to teach to Gengar by TM10 in Generation I and Move Tutor in Pokémon FireRed and LeafGreen, Emerald, and XD.|
|Red's Clefairy||Rage||Clefairy Transforms?!||Red's Clefairy uses Rage, which though impossible to have in Generation III onward, was available to teach to Clefairy by TM20 in Generation I.|