This trope (mc doesn't feel or has no idea of his strength) is one of the worst types one can read in a novel. It creates forced type of comedies and misunderstandings which insult the intelligence of the readers. It's okay if it happens at the start of the novel and later adjusts, but if it is the theme throughout the novel, then this becomes a chore to read.
This former heavenly king is defeated by 'professionals'. Deceived and even tricked. Such a disgrace to his title. But at least this is a decent pokemon fanfic. Would have been better if he became sort of a teacher. The good parts are the trainings and adventures, but the things I really don't like in this novel is the tournaments.