Good squad to defeat Palpatine

Ackbar lead should be able to drag you to a win against the lower tier Palpatine, but you should look into starring up Phoenix. Not only will they get you through the tougher tiers of Palpatine, but down the road, they have 2 pretty good ships(that help unlock Chimera capital ship), they unlock Thrawn(one of the best characters in the game still), they can potentially carry you through Territory Battles, and they're solid defensive team for Territory Wars and Grand Arena.