Call the Strongest Demon Here!

"Thunder God Thor, Izanagi, Quetzalcoatl, are these all monsters?" "Yes, without a doubt" "Is Erlang Xiansheng Zhenjun also a demon?" "Strictly speaking, all gods on earth are demons." "Pause, then you are an alien race, right? The great race Yis, are you also a demon?" "Yes, I am a demon too." —————— Lin Kong died and was resurrected. He wants to complete an illustrated book - "The Great Demon Illustrated Book". He thought this was the path to becoming a Pokémon Trainer, but he found out that he was very wrong. This is a pure fighting world, the kind that requires both brains and muscles. It has nothing to do with the Nintendo Legal Department! Abnormal Event Countermeasures Bureau, Daiyou Foundation, University Federation, Constancy... "I'm going to meet all the monsters here anyway, so why not call out the strongest monster here now?" —————— "Are you an ENFJ type of personality? Then it's easy to guess your type of contract demon and sorcery. Trait type, right!? You are a trait type!" "As you can see, the 'oath' I made is - 'As long as I wear underwear of different colors every day, I can gain the abilities of my contracted demon in different forms." … "Stop for a moment. Do I need to pay?" "Uh... I mean, your circus asked you to perform specifically for me. It shouldn't be free, right?"