just make sure every single one in the party combo together for the exp bonus. Eva and Shasha are burstable so you could do that if you want. Just remember that if you want Shasha and Eva to be good you need to wash their WIS to CON at lv20.

If you have e-rem on water, you can make it revive dead pets since you probably should be training at a place where the enemy mobs are 15-19 levels higher than your pets.

So just combo together. thats it