(No System, one heroine who is a Ditto, original worldbuilding, possible OOC, the protagonist may often run into Xiaozhi and others)
Synopsis:
After awakening memories of his past life as Cheng Yinji, Mu Chengyin makes a promise with an unassuming-looking genius Charmander at Professor Oak's Laboratory: they'll become the strongest.
But as time goes on, Mu Chengyin realizes just how much of a genius his Charmander is!
Mu Chengyin: “Sheesh, you're a genius! How about this: you go to school, and I'll be your Pokemon. Once you become the world's first Pokémon Professor, you can make the whole family proud!”
What Mu Chengyin doesn't know is that the parallel Pokemon world he lives in is far from simple. For unknown reasons, some Legendary Pokémon have fallen asleep, causing disasters.
The greatest disaster of all is the llama with three sons.
Arceus: “You born-dangerous little brat. I'll personally...”
Mu Chengyin: “Charizard, where's my Charizard?
Ah! Just you wait, llama! You're going to regret this!”
In the end, new gods replace the old at the behest of divine messengers, and even Legendary Pokémon have to clock in for work...