[The protagonist has been a Pokemon Trainer before. No lazy assumptions or random writing.]
“Miss Xilin, how did you defeat the Elite Four so quickly and become Champion? Is there some secret?”
“You should talk to your Pokemon more and build their affection. Prepare little gifts for them now and then, and interact with them in a special way during that special holiday. Then, in a mysterious moment deep in your heart, confess your feelings to them!”
“Finally, they’ll agree to be with you. Once you’ve seen their special CG, you’ll have truly caught them, and they’ll become your partners who will never leave your side.”
“Then why do all your current companions see each other as rivals in love?”
After transmigrating into the Kalos Region of the Pokemon world, Xilin obtained the Achievement System. Whenever she meets a certain condition, she can claim a reward in the real world. But... what do you mean, “You have successfully completed the hidden achievement: Conquest of All Companions. Your relationships with Zeraora, Meowscarada, Diancie... can never go back to the way they were”?
(The team is packed with jealous cats and dogs.)
[Xilin specializes in Electric types and is a pufferfish prone to getting carried away.]