For me, it's Caitlin.
Just imagine taking her hand into yours, placing another on her waist, and dancing with her across an elegant, Chandelure-lit ballroom, hearing her laughter ring through the quiet hall as you tell her corny jokes and recount some scandalous tales of you and your Pokemon.
Imagine, as the night grows longer and you both tire from dancing, retiring to her master bedroom for the evening. Laying her down gently on the bed before falling down next to her, becoming partially enveloped in her beautiful golden hair glistening beneath the moonlight that pours into her room from her balcony window. Imagine lying down next to her, both of you drowsy and sleepy-eyed, looking deeply into one another's eyes as windows to your souls before cuddling closely and falling asleep in hair softer than eiderdown, not even stirring until 10-11 AM the next day.
