Heartwarming / Pokémon Rejuvenation

• After the two of you spend the day in Goldenwood Forest, Melia tells you that she's going to be going to Grand Dream City to be the Normal leader soon, and asks if you want to come with her. Considering you only met her that day, and that you've got nowhere to stay due to your mother Nancy's kidnapping, this was incredibly sweet of her.
• There's a small scene in Teila Resort in which Tesla, after hearing from Melia about what happened to your mother, swiftly proceeds to fix a room for your character and makes it clear that she intends to adopt you. Why? Simply out of good will, since she doesn't want you to grow up without a parent. Too bad it gets interrupted and ends up in a shouting match between her and Amber.
• During the Amethyst Garufa ruins subplot, after April gives the Phase Dial to the Solrock and Lunatone, they inexplicably start dancing. In what's a really adorable moment, April shrugs and dances along with the player, talking about how fun dancing is.
• After you fix things in Goldenleaf Town, talking to the residents has most of them apologising for their earlier actions and generally being much friendlier.
• The end of the "Do Nothing" route in Chapter 12: Amber, Mosley, Kenneth and Tesla admiring the new world, talking about how they're going to make it a better place for everyone. Even Valarie gets to join in!
• Completing the Lost Camp sidequest treats you with a scene of Mosely, while sad that Maman passed away from her illness, vowing to turn over a new leaf and to continue her job in the Lost Camp to take care of every single child you found through the quest. She proceeds to thank you for helping her out so much through the entire game, gifting you a Starly she raised from an egg, and giving you the largest relationship point increase in the entire game (An astonishing +999).
• Nastasia stole the still Taken for Granite Venam from the Hospital of Hope of her own initiative to bring her to the Spring of Rejuvenation, seemingly hoping that it would be able to heal her along with Allen, Alice, and Melia. It worked, and she's fine again. Really makes you wonder how much of her cold attitude is genuine...
• The Long Lost Sibling reunion at the end of the Pyramid arc. Up to this point in the story, Melia has lost her adoptive father and learned that she has been lied to by Spacea and Tiempa, and been targeted for the "light" in her. Allen and Alice both spent potentially most of their lives in the Unown Dimension, to the point that Alice didn't realize the real world wasn't the same place and goes sorta crazy for a bit. Allen had to learn and adjust to this whole thing, as well as the fact that his sister was pulling a More than Mind Control on him. And Erin grew up in a Friendless Background and was apparently neglected by Souta to a degree, enough that she was planning to kill herself. Even if it's only the start of things, they've all got each other now, at least.
• Near the end of Chapter 15, if you have the Weird Diary and show it to Ren and Aelita during chapter 14, Aelita reunites Rhodea with Gloria the Hippowdon, one of the last things Rhodea has from her father.
• In the Paragon timeline where Karen's alive, you have to deal with her latest acts of chaos in Alamissa Urben alongside Alexandra, Damien and Ryland. As you do, the three of them have flashbacks to when Karen was sane, which show her to be a kind, compassionate person who supported Ryland as he transitioned and tried to help Damien become stronger by serving as his rival.
• In the Missing Children quest, the player and Dylan's crew instantly and unreservedly adopt Ana, despite her being A, an android, and B, hunted by V. The player, Particia and Dylan serve as her big siblings, and Peony as her grandmother. Peony, despite knowing that Ana didn't have much time left, still 'adopts' her and sends Ana to Sienna so she'll become accustomed to the idea of death.
• Rejuvenation developer Zumi was working on a fangame of her own called Pokemon Xenogene, but eventually gave up on it in order to devote her time to Rejuvenation. Version 13.5 brings Xenogene to life by turning it into a quest where the player, Melia, Erin, Ren, Venam and Aelita are recruited to make Xenogene into a movie, and you play through the early part of the game. The Rejuvenation developers going out of their way to make sure that at least part of Xenogene lives on is really sweet.