Playing a primal groudon deck at the moment, started with mega manectric for energy acceleration but found it rarely got used and the lil landos were more effective even if they were somewhat slower, but just a standard manectric ex or two really helps for taking out yvetals. The deck just suffers a bit against the toad because hes super effective against the landos and it makes it hard to mega evolve without ending the turn, and to get energy into the discard to attach to groudon (although scorched earth stadium really helps for that) but if you survive long enough to get primal groudon set up its pretty clear sailing.