Ah yeah, it sounds like it'd be taki (waterfall) as the ~n sound before modifying it to "~daki - is there a waterfall on the stage? And I dunno what enemy characters make an apperance there, but "elekin" being some enemy character definitely sounds plausible. Are there many fish enemy characters in this scene? (I never really played through Bonk.) I'm thinking maybe えれきん(erekin) is something like an "electric kingyo", - "electric goldfish"? Just a guess.
And I'm definitely not too sure about "Dekadan" being Decadent, but デカダン is supposedly the word for "Decadent". It doesn't sound too bad in context, but the fact that they don't use katakana actually throws things out a bit - as I'm not sure if the word I don't know is a native Japanese word or a borrowed foreign word.