Tested and working with pcsx2.r1888 . I turned off the HP in battle code becuase it messes up the VIT bar in menus for me, but it does work.
Code:
gametitle=Wild Arms 3 [SCUS_972.03] (USA) [06441001]
//infinite hp battle(Makes Vit Line Crazy for rest of Game)
//patch=1,EE,20590F90,extended,0000270F
//patch=1,EE,205939F0,extended,0000270F
//patch=1,EE,20596450,extended,0000270F
//patch=1,EE,20598EB0,extended,0000270F
//infinite FP
patch=1,EE,20590F94,extended,00000064
patch=1,EE,205939F4,extended,00000064
patch=1,EE,20596454,extended,00000064
patch=1,EE,20598EB4,extended,00000064
//Max gella
patch=1,EE,20664EEC,extended,05F5E0FF
//Apple slot 1
patch=1,EE,10668324,extended,00000017
//INF ECN
patch=1,EE,20664EF0,extended,0000000A
//Infinite Item Usage
patch=1,EE,2018D4B8,extended,00000000