How awful it is.
Pansage was a bad Pokemon compared to Pokemon like Whimsicott, Petilil, or Leavanny, but at least it was usable.
Panpour was actually not so bad compared to the other Water types, especially considering the low variety of them in Inova.
Meanwhile Pansear was just awful, and incinerate being less powerful than Vine Whip and Water Gun made it objectively worst than the other two monkeys. His low power attacks just made it horrible to use, even against the first gym.