Delaney was a top trainer, who battled against Misty's Poliwhirl and won. He also battled Ash's Bayleef, but the match was a draw, as both Pokémon were exhausted. He also encountered Team Rocket and was fooled enough to give his Poliwhirl. However, the heroes helped him get it back, to which he thanked them.
Delaney's Poliwrath was stolen by Team Rocket but Delaney got him back with the help of Misty.