Just two things:
1- replace Giga Drain on Dhelmise with either Shadow Claw or Anchor Shot/Gyro Ball. It doesn’t need 2 Grass moves, especially when Power Whip is much more useful.
2- Shedinja benefits more with a Focus Sash. Also replace Bug Buzz with X Scissor and Will O Wisp with Swords Dance.
That’s all- the rest of your team looks pretty good.