Actually guys in episode #09 'The School of Hard Knocks" somewhere towards the start of the episode a young student from the trainer school is being 'tortured' by the older students as they ask a series of questions relating to Pokemon while the boy runs on a treadmill. The boy is asked about Pidgey's special attacks the boy replies "Pidgey's special attack is gust, at level 5 sand attack, at level 12" He is then quizzed on it's evolved state and at what level it evolves at. And then blah blah Ash comes along and saves the day.
So at the Pokemon Tech School they are taught about the Pokemon's levels, in fact the Anime does include Pokemon levelling, it's just not often used in dialogue.
Although I do agree speculation into Pikachu's actual level would leave it somewhere in the high 80's - early 90's.