metagame need choice items and more volt+turn combos... stall is very reliable because offense without choice items and no volt+turn makes it so easy to predict... also the pokemon you use are quite limited since in the offense department you only have scizor, gyara, weavile, togekiss and maybe tyranitar... It's very hard to find a worthy chimchar/riolu/dratini+marvel scale to sweep... so with limited sweepers, no choice items, no volt-turn.. yes, stall is the way to go, like in gen 2