Rank AA, and NF could be a counter for that Crossbones (if you start in 1st phase and go over in 2nd phase, the poison will be gone).
For that boss. Hyperion and I abom is good r5. However I personally would go with archangel provided he is duped.
Rank AA, and NF could be a counter for that Crossbones (if you start in 1st phase and go over in 2nd phase, the poison will be gone). Hype or Kingpin are much better counters.