WARNING: The following text may be redundant, not to say cringy. (Why am I even doing this.)
It was probably the saddest scene in Pokémon for me - when N finally said 'Farewell' and left, leaving behind his broken castle where he has once been coronated. When he was smiling even in his farewell scene, that just made it even sadder for me and I cried all the tears he was most probably holding back.
(If you're now thinking: holy crap, it's just a fictional character - well yeah, it is, but this one fictional character meant so much to me, he gave the whole 5th generation a sense that none of the others ever had.)
So, here you have him.
N, standing in his throne hall in front of you, surrounded by the golden light that came through the hole in the wall of his castle where his throne has once been, saying farewell to everyone he knew to fly away with his Pokémon of truth, leaving you behind with all the hopes and wishes you had, believing he was not what he always considered to be the reason for his life: But you are my hero, N.
(I actually played the black version, but it fits so much better this way.)[N and Reshiram belong to Pokémon.]