How does a Pokémon learn an unreachable move?

How does a Pokémon learn an unreachable move? - Side view full body of little ballerina practicing Arabesque position while training skills in dancing school

For example, I see that Aegislash has the move Head Smash in its move list, but it actually can't learn it by leveling and both pre evolutions don't even have it. So how can it learn that move?






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How does a Pokémon learn an unreachable move? - Graceful ethnic little ballerina dancing in studio
How does a Pokémon learn an unreachable move? - Positive Asian grandmother or nanny in casual wear teaching smiling adorable girl to play chess in light room
How does a Pokémon learn an unreachable move? - Crop nanny and preschool girl playing chess





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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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