Please let there be an avalanche.
Please let Ash and Serena get separated from the group.
Please let Serena tell Ash her feeling because she thinks she is doomed,and she thinks that she'll never get another chance to tell him.

Or at the very least let them huddle together for warmth!.

Serena "Ash, if we don't get out of here, I just want you to know I lo-"
Rescue party "YO DID WE COME AT A BAD TIME?!"
Ash "Nope not at all!"
Serena "Arceus…f*cking…dammit…"