It's been years since I've heard this specific version of the trainer battle music in Pokémon—I had Red, back then—but hearing it now on violin and piano evokes old memories.

This performance by krissalad is great and makes me wonder what other Pokémon songs would sound live.

Pokémon Red & Blue - Trainer Battle Theme (Violin & Piano) ft. 8Amaterasu8 [krissalad]