When first entering the ametrine mountain, the player will meet Aya, Cain, and Hardy next to a huge solid ice wall. After some attempts to break the ice, Hardy suggests that they should go to Calcenon City first.
After obtaining the HM Dive from Charlotte, the player will have access to battle the PULSE Avalugg located in the center of the mountain. After defeating the PULSE Avalugg, the road towards Ametrine City will be accessible.
Later on after successfully rescuing Heather, the player will team up with Cal and Shelly to chase Blake in the mountains. Before reaching the mountain peak, Aster will challenge the player to a battle ONLY IF the player chose to NOT give the ruby ring to Blake. After the player defeats him, he hands the player the HM for Waterfall and resigns from Team Meteor. When the player reaches the peak, Shelly has already lost to Blake and Blake will challenge the player to a double-battle. Shortly after losing to the player, Team Meteor's helicopters arrive and Blake escapes.