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We present experimental results on thermoelectric power ({\em S}) andelectrical resistivity ($\rho $) of pseudobinary alloysHo(Al$_x$Co$_{1-x}$)$_2$ ($0 \leq x \leq 0.1 $), in the temperature range 4.2 Kto 300 K. The work focuses on the effects of static (induced by alloying) anddynamic (induced by temperature) disorder on the magnetic state and electronictransport in a metallic system with itinerant metamagnetic instability. Spatialfluctuations of the local magnetic susceptibility in the alloys lead to adevelopment of a partially ordered magnetic ground state of the itinerant 3delectron system. This results in a strong increase of the residual resistivityand a suppression of the temperature-dependent resistivity. Thermopowerexhibits a complex temperature variation in both the magnetically ordered andin the paramagnetic state. This complex temperature variation is referred tothe electronic density of states features in vicinity of Fermi energy and tothe interplay of magnetic and impurity scattering. Our results indicate thatthe magnetic enhancement of the Co 3d-band in RCo$_{\rm 2}$--based alloys upona substitution of Co by non-magnetic elements is mainly related to aprogressive localization of the Co -- 3d electrons caused by disorder. We showthat the magnitude of the resistivity jump at the Curie temperature forRCo$_{\rm 2}$ compounds exhibiting a first order phase transition is anon-monotonic function of the Curie temperature due to a saturation of the3d--band spin fluctuation magnitude at high temperatures.

Effect of static and dynamic disorder on electronic transport of $RCo_2$ compounds: a study of $Ho(Al_xCo_{1-x})_2$ alloys