OK, the scenario is this. Provided no Rocks are up.
Turn 1 - Latias vs something. Latias CM as you switch to Lele.
Turn 2- Latias CM again as Moonblast does 45 - 53% to it.
Turn 3 - Latias CM again as Moonblast does 36 - 43% to it.
Turn 4 - Latias's Recover is now healing more than Moonblast. This is even worse if Rocks are up on your side as Psychic Terrain Stored Power at +3 can OHKO Lele.