I watched Pokémon Best Wishes episode BW033/Pocket Monsters Best Wishes Ep 036 "Enter the Dragon Buster! Iris and Doryuzu"/"Iris and Excadrill Against the Dragon Buster", and I wondered why Langley/Georgia became a "Dragon Buster" after suffering a great loss to dragon type Pokémon from the Village of Dragons. This fanfic could possibly explain what happened.
As a young girl, Georgia was shy and distant around others. At the time she first started as a Pokémon trainer as she grew older, Georgia's parents gave her a Cubchoo for her birthday to raise and take along on her journey throughout the Unova region.
When Georgia first started training, she battled many wild Pokémon and other trainers' Pokémon along her journey with her Cubchoo through the region. She had many wins and a few losses against other trainers, but she was still determined to take down her rivals and become a better trainer.
With her experience in battle, Georgia continued training and managed to get stronger by overcoming Pokémon type disadvantage and teaching her Cubchoo new moves.
Further on her journey, Georgia heard from another trainer that said that the Village of Dragons was holding a Pokémon battle tournament. Georgia agreed to enter the tournament with her Cubchoo to take on the other contestants' Pokémon.
In the tournament, she managed to defeat several trainers up to round 3; however it was a completely different story when she was about to face a dragon master with a Hydreigon in the fourth round.
During round 4 of the tournament, Georgia's Cubchoo struggled to attack Hydreigon despite having a type advantage as an ice type and was hit hard with a powerful dragon type attack, "draco meteor". At the end, Georgia had lost to a dragon master. With the defeat she faced, she had no comment on her loss and wanted revenge.
With the loss she faced, Georgia wanted to take on other dragon type trainers from the Village of Dragons to get back at the humiliating defeat against the dragon master; she did not want to give up on her loss and wanted to battle other dragon types.
Georgia continued to battle dragon type trainers; but again, she wound up losing again multiple times to dragon types. Her Cubchoo and other Pokémon were taken out by outrage, dragon rush, and other powerful moves.
Eventually one day, her Cubchoo evolved into Beartic while battling a Haxorus and she managed to defeat the dragon type.
After her victory against the other trainer's Haxorus, Georgia labeled herself as a "Dragon Buster" that sought revenge on dragon types.
