I recommend Nuzleaf/Shiftry and Manectric. Why? Because w/ Nuzleaf/Shiftry's Chlorophyll ability, you can go the distance against Tate and Liza... Lunatone and/or Solrock won't be able to do any damage against Shiftry, or at least not make it faint, because of Shiftry's higher Sp. Def., even w/ Solrock's Flamethrower.. However, if you have Emerald, Xatu can haunt you, that's why I mentioned Manectric as a pokemon you can use. The best time to use Manectric is when Solrock and Xatu are out, because if those two pokemon aren't out, and Lunatone/Claydol are out instead, then Earthquake and/or the Hypnosis/Calm Mind/Psychic combo will probably make Manectric faint... If that's the case, take Claydol down w/ Shiftry before it even gets the chance to use EQ...