Hey,
This team looks decent, but it has a large weakness to Lucario and Fighting type pokemon in general. Since Hydreigon looks the least important pokemon in your team because is redundant with Salamence, you could replace it with Nasty Plot Mew. Mew can act as a check to pokemon like Terrakion and Conkeldurr while still being able to weaken Special Walls. Here's the set:
Mew@Leftovers | Synchronize
Timid Nature | 4 Def / 252 SpA / 252 Spe
Nasty Plot / Psyshock / Aura Sphere / Fire Blast
Good luck!
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