There is a way to solo that by going to the door you are supposed to go to and looking at the top left corner of the door. There is a small opening where you can jump through and bypass the door.
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Did it yesterday solo. You get an emblem and 3 of coins works on him
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bump for later plz
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▄︻̷̿┻̿═━一▄︻̷̿┻̿═━一(づ。◕‿‿◕。)づ