Originally Posted by Fat Darth Kaiser
Ok so I was reading this post a while back and even though it's old I think I solved the mystery
SLOW START :O
Yes that's the only logical explanation, I'm guessing the turn you faked out was the last turn of slow start and on the next turn Regigigas was fully awakened his attack and speed were not halved anymore and PWND your weavile.
Think about it....it's logical
Weavile outspeeds Regigigas even if Regigigas is not under the influence of slow start even if Weavile has a hindering nature and a speed IV of six or higher. In addition, not a single one of the four Regigigas' that appear in the battle tower have a quick claw or a choice scarf, so the only conclusion left to be drawn is that the 'glitch' is simply a result of human error.