Fifi's ears perked up the instant she heard the Lucario refer to her as a 'princess', and although he had already called her that a few times now, this was the first time she had really thought about it. She quickly turned to face him with a wide smiled appearing on her face, as her tail began to affectionately wag. "Princess? You think I'm a... a princess?" she asked, her voice mixed with a combination of happiness and hope, with a slight hint of excitement in it. It had been so long since anyone but herself had referred to her as a 'princess' that if it was not for the calming effects cast on her by the others, she'd surely be jumping around in excitement despite her dire physical condition. However, Fifi managed to completely fail to pay attention to whatever the Lucario's answer was to her deeply hopeful question, as her mind became awash in a mixture of different memories brought on by hearing the word 'princess'. Her eyes seemingly sparkled full of nostalgia and thoughtfulness as she entirely lost her focus on her surroundings and she was pulled into a powerful flashback.
The first memory to resurface was a positive one that regarded one of her previous owners, who she had not seen for well over a year now, almost two years now in fact. Her previous, and only, owners were a ridiculously rich married couple that owed their wealth to many years of fraud and unethical business practices. Of course, Fifi never could of known that, and as far as she knew, her owners were the kindest and sweetest humans that ever existed. In fact, Fifi legitimately thought that her owners were her own parents and often referred to them as 'mommy' and 'daddy' as fifi had never met her real birth parents. See, the law of the land states that Pokémon can not be caught or owned until they have spent at least 8 weeks with their biological parents/family as this is usually critical to their psychological development, but Fifi was illegally brought by the couple while she was still in her egg, and so when she hatched the first beings she saw were her owners and was brought up to think they were her parents.
The memory itself was very comforting for Fifi to relive, it was one of her 'daddy' cuddling her. She specifically recalled her 'father' gently placing her atop her own bed that was within her own room, and him kissing her on the forehead before he said "I love you princess, but you know it is way past your bedtime, and you need your rest". Fifi smiled to herself as she further recalled how she purposely gave him the cutest look she could muster to try and guilt him into staying with her longer, which was successful, as he noticed and said "Very well princess, but only because I love you" he then kept affectionately playing with her ears while he cuddled her until she fell asleep. As if from instinct Fifi began to actually purr aloud as the memory played out in her head, but as she enjoyed the moment she was then hit by another memory, this time it was one regarding her 'mother'. She recalled that she was purposely winding up her 'mother' by stealing socks out of the sock draw and putting them in the wash bin in plain view of her 'mother' knowing that it displeased her. She then recalled how her 'mother' walked up to her, picked her up and said "Young lady, this is not the behaviour suitable of a princess. And you know what the consequences are for such misdeeds" before tickling her tummy for about a minute or so. Fifi again smiled and purred so immersed in her memory that she failed to realize her surroundings.
But behind these positive memories of Fifi being pampered by her owners, and treated as if she was literally their own daughter, was a dark truth that she was entirely unaware of. Fifi's 'father' suffered from infertility and therefore was unable to have children of his own, this is why the couple had spent a fortune on illegally obtaining a poke-egg and raising the Pokémon as if it was their own daughter. They had lied to Fifi her entire life about them being her parents and even to this day she believed it, after all why would she not believe it, they were all she knew at the time. But then suddenly Fifi's stance and pose became defensive and uncharacteristically aggressive as another memory resurfaced, the memory of the last time anyone else called her 'Princess' before Lucario just now. It was the fateful day when her parents were being arrested by authorities during a crackdown on corruption, fraud and bribery. Fifi to this day doesn't understand the full extent of the situation as she was, and still is, simply to young and sheltered to comprehend what was happening, but she vividly recalls seeing police arresting her 'parents' and not knowing what to do as she was also taken away by protective services, with the last thing she heard was her 'father' shouting "You leave my princess out of this". Fifi had tears collect in her eyes as unpleasant memory after unpleasant memory played out in her mind of her constantly breaking out of poke-rescue centres to look for her parents, never being able to find them, and struggling to survive alone until eventually being recaptured by authorities... all the time with a growing resentment of humans building inside her... these memories played out again and again as she started to cower and shake still lost in thoughts.