Dipplin and Hydrapple were both introduced as new evolutions of the Applin line in the Pok\u00e9mon Scarlet<\/em> and Violet<\/em> DLC, and Kieran might\u2019ve been the one to discover that final evolution according to one fan theory.<\/p>
Kieran\u2019s character arc and Applin\u2019s new evolutions were two big aspects of The Teal Mask<\/em> and The Indigo Disk<\/em> DLCs. Through the two-part story, we watched as Kieran went from being the shy kid to becoming the arrogant BB League Champion, motivated to be better than the player. During this period of growth for Kieran, his Dipplin also evolved into Hydrapple at some point after The Teal Mask<\/em> and before The Indigo Disk<\/em>. According to an interesting headcanon in a Jan. 15 Reddit thread<\/a>, this could\u2019ve been when Hydrapple was first discovered.<\/p>