Finally did it!!!
Just beat 6.2.6 Champion!!!
Used Symbiote Supreme to bring him down to 10% and Sunspot to finish off.
From 5 star Crystal, Got a Hawkeye dupe
From cavalier crystals I got 2 3 star champs and 1 4 star
From the rankup gem crystal, I got a skill r3 to r4 gem which I might use on DD Netflix