'''Hall Matron Argenta''' (Japanese: '''ステージマドンナ ケイト''' ''Stage Madonna Kate'') is the [[Frontier Brain]] in charge of running the {{Gdis|Battle Frontier|IV}}'s {{DL|Battle Frontier (Generation IV)|[[Battle Hall}}]]. She is the only character in the games to have the {{DL|Pokémon Trainer|Trainer class}} '''Hall Matron''' (Japanese: '''ステージマドンナ''' ''Stage Madonna'').