Meowth's origin story is quite interesting. He grew up in an alley where he had to fight for food. He was often bullied by other Pokémon. But one day, he saw a human using money to buy things. That's when he decided he wanted to be part of the human world. So he started learning human ways, which included learning to speak and walk like them. His journey wasn't easy, but his strong will led him to become the Meowth we know today.
Well, Meowth's origin story is quite cool. Meowth was born in the Pokémon world, just like other Pokémon. However, what makes its origin special is that it has developed an affinity for human - like behavior and communication. It's thought that over time, Meowth's species started to interact more and more with humans, which led to it learning to talk in the language of humans in some situations. This interaction also influenced its way of life and how it behaves compared to other Pokémon.
Well, Meowth was born in a place full of other Meowths. But he was not satisfied with the simple life of just hunting and sleeping like the others. He noticed humans and how they had a different kind of power with their money and complex social structures. He started to mimic them. He spent countless hours trying to form words in the human language. He also practiced walking upright, which was very difficult for a Pokémon used to moving on all fours. His fellow Meowths thought he was crazy, but he didn't care. He kept on his path towards being more like a human. This led to his unique identity among Pokémon and his ability to communicate and interact with humans in ways that are quite extraordinary.
One reason could be unrequited love. In the Pokemon world, Meowth has a soft spot for certain Pokemon, like the Skitty. If in a fanfiction, Skitty rejected Meowth's advances, it would make him sad. Another could be his longing for acceptance. Meowth is a part of Team Rocket, but often they don't fully appreciate his skills. He might feel sad and underappreciated in a fanfiction scenario. Also, memories of his past life on the streets, before joining Team Rocket, might haunt him and bring about sadness.
However, over time, he could develop resilience. The experience of being abandoned might force him to become stronger, both physically and emotionally. He may learn to trust again, but it would be a slow process as he has to overcome the initial emotional trauma of abandonment.
One sad Meowth story could be that Meowth was in love with a female Meowth. But she rejected him because he could speak human language which made him different. He was left all alone, feeling heartbroken and out of place in his own kind's community.
In a fanfic about Meowth evolving, it could be that a powerful enemy forces Meowth to adapt and evolve in order to protect its friends. This evolution might give it new abilities and a different appearance, perhaps more intimidating to foes.
A writer can use Meowth's body language. For example, they can describe his drooping ears, his slow and slouched walk, and his tail hanging low. This physical appearance immediately gives the readers an idea of his sadness. Also, the use of simple dialogue like 'Meowth meow (I'm so sad)' can be effective.
Meowth in Team Rocket has a sad story mainly because of his unrequited love for a female Meowth. He learned to speak human language in the hope of impressing her, but she still rejected him. This made him feel very sad and lonely, yet he continues his journey with Team Rocket.