Just for the record Rock Slide Exca flinched my Icy Wind Sigy, which would had killed 1% Exca, allowing Gyarados to stay in and not forcing me to double switch, and put ttar at 0 speed (not rly important at the time, but could had helped depending on how you played it later on). Healthy Terrakion, healthy Aegislash, Lum Gyara, Mega Manectric, and Sigy beat 70~ Conkeldurr, 60~ ttar, Sableye and Sigy easily.
Rock Slide did help me (I still had a chance with Manectric + Sigy + Gyarados, because that wasn't Jolly Ttar [unless bad spread jolly ttar that out speeds Manectric and not Terrakion] ), but it was right after it dicked me and forced me to make a risky play.