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Route 26, Route 27, Victory Road, and Tohjo Falls all use Johto Battle music when you battle a trainer or encounter a wild Pokemon. Where would I go in the ROM to change it so that Kanto Battle music would play instead?
“To live is the rarest thing in the world. Most people exist, that is all.” ― Oscar Wilde
Kanto gym leaders are based on trainer class ID, which is not relevant here.
Based on the code in that link, normal trainers and wild battles play the Kanto music if calling 24:694E leaves a non‐zero value in e. I suggest looking at the code at 24:694E to see how it determines what region you’re in.