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I lead with my Manectric.
Generally, I mega evolve turn one and use Volt Switch to bring in either Ferrothorn or Sylveon, depending on what I'm facing. Either way, by mega evolving and gaining Intimidate, I can usually bring in either one safely. If it's Ferrothorn, I can get Stealth Rocks up easily and if it's Sylveon, I can set up a Wish and bring in nearly anything else on my team with little problems.
Mega Manectric may be a one trick pony, but it does the job well.