  In this work we investigate the reaction $\gamma p\to\pi^-\Delta^{++}$ in the
Reggeized model for $\pi(138)+\rho(775)+a_2(1320)$ exchanges in the
$t$-channel. For a convergence of the reaction cross section at high energies
the minimal forms of proton and $\Delta^{++}$ exchanges are introduced in the
direct and crossed channels for gauge invariance of $\pi$ Regge-pole exchange.
The role of spin-2 tensor meson $a_2$ is found to be crucial to agree with
existing data at high energies. Electromagnetic multipoles of $\Delta^{++}$
baryon are analyzed in the $\Delta$ resonance region. Based on the constituents
counting rule the scaled differential cross section at $E_\gamma=4$ GeV is
reproduced with the Regge trajectory saturated at large momentum transfer $-t$.
