If you can get the other side out you should be able to knock the axle and bearings out and have access to inside of the seized cup to get some penetrating fluid where it needs to be.
Alternatively and somewhat controversially, you can sometimes use the cartridge to force the cup out with a massive hammer. If the shell and threads are steel and the cup is alloy then you stand a chance of being able to use brute force. Worst case scenario you may need to get the BB threads chased.
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