Because of her clumsiness, Autumn initially had trouble developing a bond with her Miltank named Ilta. She was convinced that she would never get to know Ilta and wanted to release her. However, Brock convinced Autumn to let him teach her how to grow closer to her Pokémon. A lot of the training didn't work, but when she jumped in the way to protect Ilta from a swarm of Beedrill, Ilta realized that Autumn cared for her and began listening to her instructions.
Ilta (Japanese: ルータンRutan) is a Miltank who refused to obey Autumn because she just got her. Autumn was considering releasing Ilta because "she wasn't that cute," but Brock stepped in and helped Autumn gain Ilta's respect.