The out of control association pioneers were second best all through and deservedly tumbled to their heaviest loss of the mission.
The outcome additionally raised a fourth misfortune in their last six matches in all rivalries.
"The manner in which we lost isn't OK at this degree of rivalry," Pochettino said.
Wissam Ben Yedder scored two times for the hosts, flicking in a close post cross and changing over a late punishment as he moved two objectives clear of PSG's Kylian Mbappe as the top goalscorer in Ligue 1 with 17 objectives.
In the middle, he made Monaco's second, with Kevin Volland turning his shot past some unacceptable footed PSG guardian Gianluigi Donnarumma, with Pochettino obviously maddened by the way of his group's breakdown.
It additionally followed their new exit in the last 16 of the Champions League, neglecting a 2-0 total lead to lose 3-2 at Real Madrid.
"We can't begin a game the manner in which we began this one," added Pochettino. "You need to escape the dissatisfaction of end in the Champions League. You need to ponder giving the best of yourself.
"We missing the mark on battling soul against a group that needed to respond in the wake of being killed [from the Europa League].
"It's unsatisfactory to begin the match like that. There is brandishing disgrace. It can't be rehashed. We can in any case lose matches, however what happened shouldn't - and can't repeat since it's significant.
"The soul and the exhibition should be aggregate. We should quit searching for reasons and observing pretexts."With Lionel Messi missing because of ailment, Mbappe gave PSG's just genuine danger. In any case, he had not many opportunities to dazzle as the players behind him were out-battled and out-thought by their, apparently, more inspired adversaries.
"We could win 8-0 and no one would mind, they'd simply be contemplating the Champions League," Mbappe said. "We really want to stay proficient, consider our families."
PSG commander Marquinhos depicted the loss as a reminder. "Assuming we continue appreciate that the title will be in harm's way. We have been cautioned," he added.
"We came here to win and have a great time, however that was a calamity."
PSG actually stay well clear at the highest point of the table with 65 focuses from 29 games, 15 focuses in front of Rennes, and furthermore Marseille and Nice, who meet later on Sunday. Monaco climb to seventh on 44 places.
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