Flowey wasn't stuck Underground : he simply remained there by choice. Just like a few monsters did. Though, from time to time, when he knew no-one would be around, he'd travel all the way from Home to New Home to stand where the Barrier once was. Now seemed a good time to do this, as the ice monsters had left the Snowdin area once more.
He looked up at the hole above the bed of golden flowers. At this time of night, there wasn't much light coming from it. But if he left this room right now, he should have a chance to catch the sunrise on the other side of the mountain.
Snowdin Forest was so much darker and quieter when the ice monsters weren't there. Well, it wasn't like Flowey hadn't seen it empty before. A few times it had been his fault. A few times, it had been his long lost sibling's.
It still felt weird to think that this time, the Underground went empty thanks to Asriel and not because of Flowey or the Fallen Child.
He went through Waterfall. The place being oddly silent was something he had experienced in other timelines, but he was pretty sure that echo flowers going missing entirely was new. Oh, yes, Papyrus' letter from last summer did say something about Alphys and Frisk checking on these blue flowers, right? Looked like they collected most of them.
Why did that skeleton still bother sending him letters through Frisk anyway? In Flowey's opinion, Papyrus was way too forgiving.
The sentient flower went through Hotland, burrowing himself into the ground whenever possible to protect himself from the heat. He also avoided Alphys' old lab. Soon, New Home was in view. He hoped he wasn't too late.
Soon, he was standing where the Barrier once was, facing the Surface world but his whole body still remaining in the safety of the shadows inside the cave. He never dared to go any further. He didn't want to actually go to the Surface, he only wished to see the sunrise.
Dawn had already illuminated the sky, but the gold and orange hues were still up there for him to see. He kept watching as the light changed and the sky finally settled for a light blue with white clouds scattered everywhere.
Flowey appreciated how sunrises and sunsets never looked the same twice. Before Frisk came to the Underground, the flower had already done everything, heard everything everyone had to say in every situation… It was nice to have at least one thing that would always be different each time no matter what. He was less likely to get bored of it.
He turned around and left. As beautiful as the sky was, he didn't like to linger near the Surface or the castle for too long.
[Note : Remember that letter that was briefly mentioned in the first chapter of Echoes? Well now you know who wrote it. Finally. ^^]