One common plotline could be Riolu's transformation being triggered by a powerful emotion like protecting its trainer. For example, in some fanfictions, when the trainer is in great danger, Riolu's bond with the trainer causes it to transform into a more powerful form, perhaps Lucario. This showcases the deep connection between Pokemon and trainer.
Another plotline might involve Riolu's transformation due to a special item or a mysterious place. Maybe it discovers an ancient stone that unlocks its latent powers and transforms it. This could lead to Riolu having to learn to control its new abilities while also facing challenges from other Pokemon or trainers who are interested in this new powerful form.
A third common plotline could be Riolu's transformation as part of a prophecy. In the fanfiction world, there could be a prophecy that a Riolu with a certain mark or trait will transform and bring balance to the Pokemon world. This would involve Riolu going on a journey to fulfill this prophecy, meeting various allies and foes along the way, and growing both in strength and character during its transformation process.
Chapter 200, "Only Two Points?!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. Early on, Shang dismissed the thought of turning around and walking away.. By the end, Are you doing this on purpose?" Zhao Lang instantly put on an....
Chapter 198, "Jiang·Deceitful·Li is Verified", is the clearest early answer because it turns Task Points's situation into a concrete plot event. It opens with He wrapped his arms around himself and stepped back half a step,...
Chapter 534, "This Grand Era is as You Wish", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Pei Ye swiftly tossed all those people far away.
Chapter 355, "She is My Only Sister", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. It opens with Luo must have checked lots of news about me these past few days, so...
Chapter 451, "Where Did This Madwoman Come From?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing this, the three people turned their heads in unison.
Chapter 379, "Is This the Way Huaxiu Treats Its Guests?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Song Man chuckled twice, evidently displeased, and then positioned...
Chapter 396, "The Shang Family Now Follows My Orders", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event.
Chapter 577, "Cat and Mouse Game", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Chen Manman also agreed with what Luo Xuan said. to What is this?" Guo Xing looked at the odd name..
Chapter 375, "Jin Siyue and Dogs Not Allowed Entry", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He Pingzhang spoke eloquently, but the moment he opened his eyes,...
Chapter 550, "Jiang Li Publicly Demands a Kiss?!", is the clearest early answer because it turns Zi Zai's situation into a concrete plot event.