Actually, without high/max SpD, Accupressure Drapion can't take neutral Special Attacks like Signal Beam or Ice Beam at all. That's why both people in the Top 10 with Drapion (Jumpman and me) use so much Special Defense. Take a look at the team dynamics of both teams and at Jumpman's previous 190 win streak team if you want to understand a bit more. They're all in the Battle Frontier Records list.
PS! Alts: WolfLink, EonADS, Her Voice Resides, Begging for Mercy(RG #8 test alts), Across the Line, TheLastAmmunition
RU Record: #3, Wolf Link; 1951 ACRE on September 22nd, 2012
UU Record: #6, WolfLink; 1947 ACRE on September 18th, 2012
Ubers Record: #12, WolfLink; 1984 ACRE on September 19th, 2012
NU Record: #9, WolfLink; 1918 ACRE on November 3rd, 2012