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Alright: while its true that only female mosquitoes drink blood and only before laying eggs, both sexes feed on plant liquids. lt is known that in their homeworld, buzzwoles lives off the juices drained from the swole trees but It is unknown if the sap of those trees is the same as ours. For all we know, It could be' akin to Blood in its composition or nutritional value, explaining why buzzwoles in alola only feed on pokemons and not on other plants. So, in Short ,they could still be males trying to adapt to their new enviroment by chasing the food source thats the closest to their original.