This reminds me of that one story in the only library in the Pokemon Diamond/Pearl/Platinum game.
The story was about a man who killed pokemon with his sword which grew more powerful with each pokemon bloodstain on it. He killed Pokemon to prove that he (or maybe mankind as well?) was stronger than Pokemon. As he killed the Pokemon, they began to gradually hide themselves from people. When no more Pokemon revealed themselves to the hunter and mankind, the hunter realized he and mankind needed them in their world. Then a pokemon spoke to his mind (Arceus?). It told the hunter that pokemon have hidden themselves from him and humanity because he had murdered so many of them. Pokemon will only come back if the hunter destroyed his sword and repented his way. The hunter listened to the Pokemon by shattering his sword's blade and repenting his way by burying the bones of the Pokemon he killed (or maybe the latest one?) and honoring their death. Soon the Pokemon came back to earth and humanity and the hunter swore he would never hunt another Pokemon for the rest of his life.
