Well i did defeat every boss buster only until dynamo that you need extreme RNG with the 8 every single attack and maybe 1 or 2 crits if dynamo doesnt crit to win even using the 3 extra weapons (well mostly because i was trying to not use) but maybe i will need to use, but now i will only need to know if its possible to defeat copy X buster only
Edit: i did defeat Dynamo buster only but i only needed 1 nova strike by luck, thats the closest match ive had before the last one that dynamo almost died with buster but its too hard and ive already at 4 hours trying this so i dont want to grind again this, time to try copy X buster only now
Edit 2: Well Dynamo could really be the final boss alone because copy X was a breeze to fight buster only, if Dynamo had 1, just 1 attack dealing 6 dmg it could be more decent to deal with the RNG because every attack being 8 dmg is almost impossible to only buster