Where is this taking place? Who is the Phoenix's avatar, or is it just the Phoenix Force? Are the Infinity stores native to the dimension where the fighting is occurring? I'm going to say that the Phoenix force would win, but that is just because there are so many variables, and the Phoenix has the highest official stats, according to Marvel.com
Since you didn’t specify, I’m assuming Thanos doesn’t have the gauntlet and this is just regular Phoenix, not Dark Phoenix or anything. I’m pretty sure Ronan, strong as he is, gets beaten by any of the other 3. The only way he could win is if he teleports far, far away and is lucky enough that nobody follows him, then comes back once everyone else is weakened or dead. That’s not happening. Iirc while Phoenix is a powerful psychic, her durability isn’t that crazy compared to other characters that the other 3 have thrown down with (Hulk, Surfer, etc.) and she could do a lot of damage, but one or two hits and she’s down. Thanos is also a pretty powerful telepath, he could probably protect himself long enough to take her out. He also has beams if Phoenix try’s to lock him in place with telekinesis. Idk if Mephisto or Ronan have any defense against telepathic attacks. Between Thanos and Mephisto, this happened https://m.imgur.com/a/N55oE I can’t really give any more insight than that, I’m not familiar with Mephisto. Thanos definitely wins if he has the gauntlet though. Edit: Didn’t see that you said Thanos has the stones. He absolutely demolishes them.
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I’m pretty sure Ronan, strong as he is, gets beaten by any of the other 3. The only way he could win is if he teleports far, far away and is lucky enough that nobody follows him, then comes back once everyone else is weakened or dead. That’s not happening.
Iirc while Phoenix is a powerful psychic, her durability isn’t that crazy compared to other characters that the other 3 have thrown down with (Hulk, Surfer, etc.) and she could do a lot of damage, but one or two hits and she’s down. Thanos is also a pretty powerful telepath, he could probably protect himself long enough to take her out. He also has beams if Phoenix try’s to lock him in place with telekinesis. Idk if Mephisto or Ronan have any defense against telepathic attacks. Between Thanos and Mephisto, this happened https://m.imgur.com/a/N55oE I can’t really give any more insight than that, I’m not familiar with Mephisto. Thanos definitely wins if he has the gauntlet though.
Edit: Didn’t see that you said Thanos has the stones. He absolutely demolishes them.