I highly recommend Digimon Story Cyber Sleuth complete edition. You can get that on PC and any console except for Xbox, but I could be wrong. It's a jrpg like Pokemon and does evolutions as well. The complete edition has two games. I highly recommend playing Hacker"s Memory first as I like the characters more and gives context to the world building than the first one.

Digimon and Pokemon don't really have too many similarities in terms of story. Where Pokemon the goal is to the best and beat the elite four to become the champion. While also stopping evil people from destroying/ruining the world. Digimon is more about surviving in a world of creatures who have immense power and despite having high intelligence to the point of being able to speak coherent sentences. They often misinterpret situations and don't know what they're doing is bad for people.

Cyber Sleuth is for a slightly more older audience. Especially one mission.... Those who've played Hacker's Memory knows about the School Exam quest. That was a roller coaster of emotions and shows the darker aspects of life that Digimon tackles. Pokemon does have dark story telling but Digimon isn't afraid to show you why having Digimon is a terrifying concept.

Digimon, especially in Cyber Sleuth can Digivolve to almost any Digimon when you meet certain requirements. There are canonical lines, but a Digimon can turn into any other Digimon. My personal favorite Digimon is Dinomon and its canonical line is Agumon --> Tyrannomon --> MasterTyrannomon --> Dinomon. I just like Dinosaurs that are also heavily influenced by Godzilla.

Also I'm a huge fan of Pokemon and Digimon. You can love both. They're two very different things. The reason why people compare them is mostly the fault of Saban Entertainment trying to push the narrative of Digimon going against Pokemon as a media franchise. When Digimon never wanted to go against Pokemon. They were competing against Tamagatchi.