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We apply bulk holographic dark energy in general braneworld models with aGauss-Bonnet term in the bulk and an induced gravity term and a perfect fluidon the brane. Without making any additional assumptions we extract theFriedmann equation on the physical brane and we show that a$\rho$-$\rho_\Lambda$ coupling arises naturally by the full 5D dynamics. Thelow-energy (late-time) evolution reveals that the effective 4D holographic darkenergy behaves as ``quintom'', that is it crosses the phantom divide $w=-1$during the evolution. In particular, the Gauss-Bonnet contribution decreasesthe present value of $w_\Lambda$, while it increases the growing rate of$w_\Lambda(z)$ with $z$, in comparison with the case where such a term isabsent.

Holographic Dark Energy in Braneworld Models with a Gauss-Bonnet Term in the Bulk. Interacting Behavior and the w =-1 Crossing