MegaZard X
Advantage:
-A strong Wall breaker thanks to Tough Claws and high attack stat.
-Has some awesome moves like Flare blitz and Earthquake.
-Dragon Dance make it a Strong Physical Sweeper, bye bye Eviolite Chansey..
-Can use Roost to negate recoil from Flare Blitz.
-Eathquake can stop Toxapex and Heatran, for it's high attack stats.
Disadvantage
-Become outsped by Choice Scarf users such as Greninja, Garchomp etc.
-Heatran, Toxapex, Landorus and Tapu Fini can easily KO it.
- It isn't much bulky to take some special attack.
- Before MegaZard X can set up, some Pokemon can easily defeat it.
MegaZard T
Advantage
-Has Drought and great Special Attack to become a special sweeper.
-Has access to Solar Beam, that can hit Water, Rock type Super effectively.
-Focus Blast deals with Heatran and Tyranitar.
Disadvantage
-Can't hit Toxapex and Chansey.
-Hate Stealth Rock, a common move.
-Defeated by most rock type attack.
-Can be Revenge killed so easily.