I've come up with a few things to replace in the Ze*n*A*ku hack.
Route 101 → Something Route 201 ver. 2 -ish?
Wild Pokemon Battle → Something like the Club Penguin music for a Card-Jitsu match, maybe?
Rival Battle → A more exciting-ish ver. of that Pachelbel's Canon?
Team Magma Grunts → 天空のグリニッジ-ish thing.
Team Magma Admin, Leader → speed-up 天空のグリニッジ-ish thing...?