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Leaders like Luke Skywalker, Poe Dameron, and Yoda will keep you from getting lit up with red effects.
Max tenacity squads: The other route you can go is to max out your tenacity. You'll be taking so many debuffs including damage over time that removing them will keep you alive longer. Consider allies that remove debuffs: Rex comes to mind, but you can also use Admiral Ackbar, Finn, Lobot, others. Unfortunately, each one of those damage over time hits on GG pushes him closer to 10 hits and a flurry of debuffs and AoE. Damage over time is not good: I love damage over time effects, especially when I'm stacking 20 against a Rancor.
You also don't need to emphasize turn meter as much as you normally would in a Squad Arena fight.
DPS over multiple hits: Because GG goes nuts on every 10th hit, you don't want to be wasting hits with weaklings like Barriss Offee or Royal Guard. Stormtrooper Han is a strong candidate since you'll also get turn meter each time he's hit. So you'll be able to funnel most of that damage to your tank. Strong tank: Aside from B-2's special abilty, nothing from GG or Magna-guard is going to remove the taunt ability. Let's start with some ground rules for building a strong Phase One team: So as you send in your top Rancor squad, you're probably in for a rude awakening. And GG automatically reduces your critical chance. GG is a major pain, blending AoE attacks with debuffs, forcing taunts to his allies, and getting Tactical Maneuvering every 10th time he is hit.
B-2 can debuff your whole team if you don't take him out or block his special ability. Phase One pits you against General Grievous, 2 Magna-guards, and a B-2 droid.