How do you beat the second gym in pokemon white? well the gym leader is a normal type pokemon user so use a fighting type and level it up enough and you have an advantidge.
if you started with tepig, try to evolve it to pignite. go to grass farthest to the left where 2 pokemons may come out. there should be timburr and throh. try to catch them around level 17. watchhog was difficult because of "retailiate" which doubles in power after the 1st pokemon is killed