How could I use a script to create a mesh?

I want to use a mesh in a script but you can't put an ID for meshparts in scripts, how would I put a mesh in a script like you would with with a part? For example if you wanted to insert a part you would just do Instance.new but how would I do something similar with a mesh?

I tried putting the meshes in serverstorage then cloning them but that didn't work properly, the script works fine if you are alone but if 2 players activate it then the meshes teleport to the player that activated it last, this is the script:

local ReplicatedStorage = game:GetService("ReplicatedStorage")




local Table = {}
ReplicatedStorage.RemoteEvent3.OnServerEvent:Connect(function(player)
local ServerStorage = game.ServerStorage		
local function ShockWave()
	wait(0.6)
	game.ServerStorage.ShockWaveMesh:Clone().Parent = game.Workspace
	local ShockWave = game.Workspace.ShockWaveMesh
	ShockWave.Position = player.Character.RightHand.Position
	ShockWave.Orientation = player.Character.HumanoidRootPart.Orientation
	ShockWave.Size = Vector3.new(1,1,0.5)
	ShockWave.Transparency = 0.5
	ShockWave.CanCollide = false
	game.ServerStorage.ShockWaveMesh2:Clone().Parent = game.Workspace
	local BodyVelocity = Instance.new("BodyVelocity")
	local ShockWave2 = game.Workspace.ShockWaveMesh2
	BodyVelocity.Parent = ShockWave2
	ShockWave2.Orientation = ShockWave.Orientation
	ShockWave2.Position = ShockWave.Position
	ShockWave2.Size = Vector3.new(5,5,5)
	ShockWave2.Transparency = 0.5
	ShockWave2.CanCollide = false
	BodyVelocity.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
	BodyVelocity.Velocity = ShockWave.CFrame.lookVector * 40
	ShockWave2.Touched:Connect(function(hit)
		local humanoid = hit.Parent:FindFirstChild("Humanoid")
		if humanoid and hit.Parent.Name ~= player.Name then
			local found = false
			for i = 1,#Table do
				if Table[i] == hit.Parent.Name then
				found = true
			end
			end
		if found == false then
			table.insert(Table,game.Players:GetPlayerFromCharacter(hit.Parent).Name)
			humanoid:TakeDamage(30)
			found = true
			wait(3)
			for i = 1,#Table do
				if Table[i] == hit.Parent.Name then
					table.remove(Table,i)
						
				end
			end
		end
	end
end)
	
	
	spawn(function()
	for i = 1,100 do	
		wait()
		ShockWave.Size = ShockWave.Size + Vector3.new(1,1,0.01)
		ShockWave.Transparency = ShockWave.Transparency + 0.005
		ShockWave2.Size = ShockWave2.Size + Vector3.new(1,1,1)
		ShockWave2.Transparency = ShockWave2.Transparency + 0.005
		if ShockWave.Transparency == 1 or i == 100 or ShockWave2.Transparency == 1 then
			ShockWave:Destroy()
			ShockWave2:Destroy()
			
		end
	end
end)
	spawn(function()
for i = 1,100 do
wait()
ShockWave2.Orientation = ShockWave2.Orientation + Vector3.new(0,0,3)
ShockWave2.Position = ShockWave2.Position + Vector3.new(0,0.1,0)
end
end)	

		
	

end


ShockWave()
end)

Prepare your meshes beforehand and clone them whenever you need them, as far as I know there's no way to load meshes at runtime other than maybe using the InsertService:

https://developer.roblox.com/en-us/api-reference/function/InsertService/LoadAsset