Monster Pet Evolution is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The world experienced a cataclysm and monsters are now roaming the Earth. Born out of a necessity to subjugate these monsters, this new era saw the rise of a new profession. Monster Trainers – individuals who conquer, cultivate, and train these monsters. Thus begins the story of Gao Peng. An ambitious young man with dreams of his own, who gets launched right into the golden age of monster cultivation. Gao Peng: “Even if it’s a loach, I’ll be able to evolve it into a dragon that can soar to the heavens!”