It's uh...grass/psychic. Not ground/steel lol.
Another thing, you have sub-sitrus twice.
Anyways, for Chesto Rest, here's a set:
Exeggutor @ Chesto Berry
Bold
252 HP/ 252 ATK/ 4 SPE
Harvest
~Rest
~Swords Dance
~Seed Bomb/Wood Hammer
~Sleep Powder
Simply sleep the opponent, swords dance, swords dance, rest, then one more swords dance. GG.
Lum is preferable over Chesto always, and this is completely walled by herbivores / Nattorei