The issue is the teleporting, I assume?
That's actually kinda advanced ASM-hack level. Way out of my ability, sorry
All I can think of is... "Taboo Noise", though. Mine would probably be Taboo Missingno
It's strange though considering that Ironhead doesn't do this and the boss fight with San in Selenic Shadow doesn't have teleportation either. The fight itself functions just fine aside from that (though I may have rewrite the post battle part of the script: You're supposed to obtain the Taboo Pin by default, but if you defeat Taboo-Oh without taking damage, you obtain the Monochrome costume. For some reason, you obtain the costume even if you take damage. Either way, you're then teleported outside the boss door in Taboo Zone 1).