Originally Posted by Fat Melee Mewtwo
Magnezone: Shed Shell Skarm still escapes his clutches, Scizor still hits too hard for it to set up properly and Hydreigon can abuse his resists and roast it with Fire Blast.
Shed Shell is a one time use. If the player doesn't know how to trap Skarmory twice, him/herself probably doesn't know how to use trapping Pokemon very effectively.
The Scizor used in team 2 has max attack EV's along with an Adamant nature. A +2 Bug Bite (Scizor's most effective move against Magnezone) is a 3HKO, but has a chance of 2HKO after rocks. HP Fire is a guaranteed OHKO no matter what, unless for some reason Magnezone's Sp Atk dropped. Substitute isn't needed, as there's no statuses to block.
I mentioned the weakness to Hydreigon, however Magnezone's purpose to make the sweep for Kyurem-B easier- not try and sweep the whole team. Hydreigon shouldn't be a problem in that regard- there's no reason Kyurem wouldn't be behind a substitute taking on Hydreigon besides Kyurem being the last pokemon left.