Good question, Sil'fer — and you are already well-informed on the topic . The Dark Flow in Phantasy Star Online Episode I & II for GameCube is a legendary weapon, but... it cannot perform combos on the console, at least not in a native or official way.Why can't you use combos with the Dark Flow on GameCube? The weapon was designed with a special mechanic: it only activates its projectile attack when the character's HP is below 12.5%.Even so, it does not support combo attacks (the famous three-hit sequences). This is a limitation of the game itself on the console.And what about modifying this? In PSOBB (Blue Burst), you can use tools to modify the weapon's behaviour — including adding combos. But on GameCube, the story is different:The console does not have native support for mods.There are reports of Action Replay codes that alter certain behaviours in PSO GC, but none known that enable combos in the Dark Flow3. Theoretically, it could be possible via ROM hacking.However, this would require modifying the game's ISO and running it on an unlocked GameCube or via emulator — which is already beyond the scope of standard use. Conclusion Unfortunately, there is no public tool or known method to add combos to Dark Flow on the GameCube. The weapon's behaviour is fixed and limited by the game's engine on this platform...To be honest, I could ask this question on the GitHub of fuzziqerSoftware but I don't feel comfortable as I have the impression they don't like my questions there, so being that as it is, I suggest you create an account and ask your questions directly to the developer, and if possible, I will apply the modifications.
https://github.com/fuzziqersoftware/newserv