Scarf kyurem-b is better because he can ohko all of these + ohko dragonite through multiscale while not relying on innacurate moves and boasting a much better defensive typing meaning its a lot harder to force out and a lot easier to switch in. That said terrakion still have the advantage of outspeeding +2 adamant dnite but i just find kyurem to be a superior revenge killer in this meta.