The two big moves for this Mon are Chloroblast and Steel Beam. While grass offers more recoil options in Woodhammer having a 150 BP guaranteed pivot is just better than a 120 BP pivot after hitting Venom 8 times.
Both Stab types Like Ground Coverage a lot. Water is also a decent option with this.
If we wanna make the pivoting more permanent we should also look at recovery. I think the most potent options are Strength SAP and Painsplit. That said 50% recovery or even leech seed/jungle healing have their merit.
Given the idea of a lead Mon Spikes/Rocks/Webs and Taunt come to mind. With the typing idt screens are as good here, since then you're gonna be hard pressed to fit enough coverage with just two moves.
Of all of these I like spikes most, as grass steel is a fairly solid typing to come in several times to set spikes and get out, while pressuring removal.
That said spikes doesn't necessarily fit well if the idea is to use moves that cut health in half (fitting spikes, Stabs, Coverage and Recovery is kinda hard)
Some miscellaneous moves that have interesting synergy with the 50% moves are Endeavor, Destiny Bond and healing Wish.
Though these feel less like defining moves and more like something that could see use.
Overall I think we have
Steel Beam, Chloroblast, Woodhammer, Heavy Slam, Leaf Storm, Giga Drain, Earth Power, Earthquake, Strength SAP and 50% recovery that would require calcs. Moves like spikes, taunt, Endeavor, or destiny bond would be optional.
