Cress received his Panpour at a young age when his brothers were also given their first Pokémon. It debuted in Triple Leaders, Team Threats!, where Cress introduced it to Ash, who scanned it with his Pokédex before battling.
Panpour was the second Pokémon Ash faced in his Striaton CityGymbattle, where it went up against Ash's Pikachu. Panpour's Double Team confused Pikachu, after which Panpour landed a powerful Scratch. Pikachu tried to use Thunderbolt, but Panpour's Water Gun hit Pikachu before he could execute his move. Pikachu then tried to use Volt Tackle, but Panpour's Mud Sport stopped Pikachu in his tracks, after which another Water Gun knocked him out.
Panpour is generally friendly and loves to battle. It is very determined to do its best in any circumstance. It is a very powerful and adept battler, able to defeat Ash's Pikachu without taking a single hit despite the type disadvantage with counters and attacks that were vicious, speedy, and above all disorientating. Panpour is also shown to have a close relationship with Cilan's Pansage and Chili's Pansear, as the three happily greeted one another upon being reunited in Survival of the Striaton Gym!.
Simipour first appeared as a Panpour. It assists Cress and his brothers in the kitchen by pouring water for tea for their customers. Simipour, as a Panpour, first appeared in Welcome to Striaton City!!, with its Trainer at the Striaton Gym where it helped prepare tea for Black, Cheren and Bianca.
Later, it was used in the Gym battle against Black, Cheren, and Bianca alongside Cress's brothers' Pokémon. They proved powerful against Black's Tep, Bianca's Oshawott and Cheren's Snivy with their type advantages. Although it managed to defeat Tep, he managed to revive its fallen teammates with some healing leaves that were previously knocked off of Pansage's head. With Chili's Pansear defeated, the challengers won the match when the time limit ends due to them having three Pokémon able to battle while the Gym Leaders only had two.
In The Shadow Triad, Panpour was used to battle the Shadow Triad at the P2 Lab. Although it, Pansage, and Pansear were at a disadvantage against their opponents, their Trainers gave them a boost of power by evolving them with their respective Evolution stone. Panpour evolves into a Simipour, but is still unable to defeat its opponent despite becoming stronger. Eventually, they are saved by Cobalion, Terrakion, and Virizion, who attacked both groups to rescue the Keldeo the Shadow Triad had captured.