Friendship bonus and attack breakpoints

This seems to discuss it:
https://www.reddit.com/r/TheSilphRoad/comments/8th95r/breakpoint_and_bulkpoint_spreadsheet_that/

Just did crunch Tyranitar duo raid, great friends, cloudy weather. A lot of 2500 cp dynamic punch Machamps on both teams, had 53 seconds left on the clock. If it wasn’t already, then duoing is just the new tier 3 solo