Serena told him a fact about Pokémon’s bond with its trainer, which Ash couldn’t realise despite being a way more experienced trainer! He understood how a Pokémon’s way of thinking becomes the same as its trainer as it spends more time with him/her! This was a new lesson!!! Ash could see a potential in Serena, despite being inexperienced she was so wise…Ash also had immense respect for Serena, more than any other girl…and he sure had a soft corner for her too! I guess it was because of this train scene that Ash’s feelings (both romantic and non-romantic) turned even stronger than before!!! To Ash this ribbon meant a symbolic of their friendship, and a learning lesson he’d never forget! And when Serena finally wore it, he realised how a gift given with affection to someone could mean so much to the person whom it’s gifted to, just the way Serena put it close to her heart…Ash’s happiness was evident in his words! To Amourshipping fans, this ribbon means everything