Greetings,
After the fight on Valor Mountain you get a letter/notice from Melia, telling you that she wants to meet you on *Lover's Bridge* in Terajuma Island's Deep Jungle. There's a cutscene, and after that she asks if you want to accompany her to Tesla's Villa or not. If you say *no*, then you have to move in specific direction, the way you came from, otherwise the cutscene restarts but then Melia's sprite is missing and after answering her question the game freezes, you have restart it. But if you don't trigger the cutscene 2nd time, then when you get to the Villa no one is there and you can't progress. So the only way to continue the story is saying *yes* during the cutscene.