>>44324685gamefreak saw how op chomp was back in gen 4 and have ensured that every pseudo since has been gimped one way or another.
hydreigon's awkward speed, goodra's everything, kommo-o not having its full power until usum and nowadays his boost move burning hp and not dealing damage to opponents.
they deliberately made garchomp's mega trash and made its hidden ability one that doesn't actively advance his gameplan and at the same time have been over-compensating for the pseudos before him, like multiscale for dragonite and the crazyness that was mega mence.
ganefreak hates garchomp and only references it because cynthia uses one and everyone loves her.