i. Diamond & Pearl
Platina’s relationship with Diamond and Pearl [and it is almost a single relationship shared between the three of them; she has dynamics with the boys as individuals, but this is more often than not outweighed by their bond as a trio] is without a doubt the most defining one of her life thus far—and one that will be difficult, if not impossible, to best in the future. She was an entirely different person before meeting them, and their journey together had nothing short of a profound impact on her life.
The Platina before Diamond and Pearl was quiet, reserved, and let’s face it: haughty. The closest she had been to real-world experience was what she found in books and the lab where she worked as an assistant to Professor Rowan, and was used to having everything handed to her. The boys catered to her whims to an extent (Diamond especially), but they steadily knocked her off of her pedestal.
On another note, she was also quite naive before them. She had a great deal of practical knowledge, and initially thought that it was enough. Upon beginning her travels with them, Platina learned very quickly that possessing information is useless if one does not have experience, not to mention true understanding. Diamond and Pearl taught her that in the end, experiencing things for oneself is the only way to attain and successfully utilize the knowledge she so desperately sought.
Perhaps the most important effect the boys had on the Berlitz heiress is that they simply taught her to live. She set out on her journey expecting simple bodyguards, but rather she found her first real friends. They made her smile, laugh, cry; they lent her their strength when she needed it, and gradually steadied her so that she was able to stand on her own two feet for the first time in her life. They taught her to be a child, and they helped her grow.
The years she spent apart from them [they originally separated to seek information on the Distortion World, and for the following four years simply were unable to reach each other reliably] were the most painful of her life. She nearly regressed into the person she was before meeting them, but having been recently reunited in Kanto, the three are as tight as ever and Platina…. well, to put it in the most simple terms: she loves them, and will not be letting them go any time soon.