You could choose Eevee. Eevee is unique because it has multiple evolution possibilities. Each evolution has a different type and personality. For example, Vaporeon is calm and water - based, Jolteon is energetic and electric - type. This versatility allows for a lot of creativity in a story. You can have a story where the Eevee is on a journey to discover its true form, which can be very engaging.
I think Grookey is a great starter for the Pokemon Sword story. It has a strong start in terms of its attacks and evolves into a very powerful final form. It can easily handle the early - game battles which are important for progressing through the story.
In Pokemon Sword, Sobble is a great choice for the story. It's cute and has a good evolution line. Its final form, Inteleon, is very powerful and can be quite useful in battles throughout the story. Also, Grookey is a good pick. It evolves into a strong and cool-looking Rillaboom, which can handle many of the challenges in the game's story.
Charizard. This Pokemon has a very interesting character arc. It starts as a disobedient and somewhat wild Charmander, evolves into a powerful Charmeleon, and finally into the majestic Charizard. Its journey of growth can add a lot of depth to a story, especially when it comes to themes like taming one's inner power and loyalty.
A good team could be Pikachu for its popularity and electric type moves which are useful in many situations. Charizard as it's a powerful fire type. And Bulbasaur which can cover different types with its grass and poison attacks. These three are classic and can handle a lot in the story.
For the story mode in Pokemon Sword and Shield, Sobble, Grookey and Scorbunny are great starters. Sobble can turn into a powerful water - type, Grookey into a strong grass - type and Scorbunny into a fire - type. They can cover a wide range of types as they evolve.
Rillaboom can be a great choice too. It evolves from Grookey, which you can get early on. Rillaboom has strong physical attack power. In the Sword story, it can be very helpful in taking on various Gym battles and facing the challenges that come your way with its powerful grass - type moves.
One great Pokemon fangame with a mature story is 'Pokemon Reborn'. It has a darker and more complex narrative compared to the official games. The story involves themes like survival in a harsh world, moral dilemmas, and complex character relationships.
In my opinion, Zacian is a must - have for the story in Pokemon Sword. It's a very powerful Legendary Pokemon. Along with Zamazenta, they are key to the story. Also, Eevee can be a great addition. You can evolve it into different types depending on your needs during the story. And don't forget about Pikachu. It's a classic and can hold its own in story battles with its electric - type moves.
Definitely 'Pokemon Platinum'. The story in this game expands on the Sinnoh region's lore in a great way. It has Team Galactic as the main antagonists who are trying to reshape the world, which adds a lot of drama and high - stakes to the plot. There are also additional elements like the distortion world that make the story very engaging.