Oh, as it just so happens, I've been chain-breeding Gible WITH an Adamant nature. I also have a Modest Abra I can breed for you. As for the others, Gastly is easy to obtain once you beat Gardenia, and with that Modest Abra, Synchronize guarantees you'll encounter Modest Pokemon if Abra's at the front of your party. I can't help with the Eevee though.