Dedenne is a Pokémon from the Kalos region and you can catch it in Pokémon Go. It is an Electric and Fairy-type Pokémon that looks almost like a unique form of Pikachu. Like Pikachu, Dedenne has an evolved form and can you evolve it into Pokémon Go?
Unlike Pikachu, Dedenne does not have an evolved form. You won't turn him into something more meaningful if you have him as a friend or provide him with items. There is no hidden quest unlocking for this, giving it an evolved form.
The standard form for Dedenne is all you get. It is not a powerful Pokémon, but it is a suitable fighter if you want to use it in the Grand League. Since it is Electric and Fairy-type, it is weak to Ground and Poison-types, some of the most frequent fighters in the Great League, but the Pokémon's high stamina makes it difficult to defeat. You can use it in different combinations, but make sure it's your main Pokémon.
We may see a more diverse moveset for Dedenne in the future. Right now, he only has four moves in total, two quick moves and two loaded moves. We'd love to see more charged moves added to his moveset to increase his utility in the Big League and make him a more interesting choice in that meta.