Golden Sun: The Lost Age Tips

Extra Healing Earlygame
A simple idea. If you want extra healing ability (without consuming your herbs) then set a Venus Djinn to Sheba (Echo joins you right after you leave Daila so you don't have to wait long). This changes Sheba's class to Seer, and amongst her new abilities is Cure, just like Felix.

Two notes about this. One is that if Sheba's Venus Djinn is changed to standby then Sheba loses Cure until it is set back to her. Second is that if a non-Venus Djinn is set to Felix at this point of the game then he'd lose his Cure ability, so if any Djinn have to go with him they would likely have to be kept on standby if you wanted to preserve his cure ability.