Foretress, Kingdra, Zapdos, Heatran, Dragonite, Metagross.
Possible switch-ins : Vaporeon, Tyranitar.
Soon to switch in : Starmie, Suicune, Gengar
HM Slaves : Snorlax, Weepinbell, Pidgeot
Yea, all are in the OU tier. In-game / Competitive battling team.