i wanted to showcase this for awhile after unlocking all default rank for hard mode about a month ago (only for lemulene lol)
this becomes a problem when hard mode increases all bosses health to oblivion, if you want to kill core unit phase 1 really fast if you don't want to reach the fourth attack, use accel. drive or overdrive immediately right after the fight began.
for phase 2 third attack hard mode, safespot works by intentionally get hit using auto-bomb mechanics or using discharge to prevent the two sides of wave bullet from aiming at you, i think it should work on nightmare and pandemonium for discharge with the game forced-disabled auto-bomb.
0:00 Menu
0:06 Pre-fight
0:38 Phase 1
1:50 Phase 2
3:07 Final