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The reason this fight is bullshit hard is this.
Gyarados and Milotic, well-optimised 540 BST monsters, at the same fucking time You are very unlikely to have anything approaching this level of power at this point.
Fortunately, Gaga has already set up her evasion and defenses. Since Gyarados is the more immediate threat, I kill it first. The Milotic's surf kills the Rhydon for me, too.
The great thing about evasion is that Urist is free to spam earthquake without worrying about Gaga, too. This fight gave me a horrible time the first time I played through.