Thanks for recommendations. Is the GBA 2nd zeta really that good? My current experience with fighting geos shows that you either have a good counter (and then it doesn't matter if GBA has both zetas) or you don't (and you're screwed or need huge gear advantage).
Similar with Palp's 2nd zeta - i noticed that i either win using my Palp team when enemy barely takes any turns or i loose badly. But if it helps with challenge tiers of ABs (i think i need some relics on Vader too) this might be the way to go.