Here is the tool that I get 90% of the tough ones out with . You can get this on amazon for under 50$.
Most times, bfh, penentrant , bfh till your hands go numb, repeat a few times, and they will usually give up the ghost eventually . You may just have to walk away a few times
You can see by how the 1/4 " striker plate is deformed , just how stubborn some of them can be to get out .
Rear bearings on Subaru is a whole other level .
Go on any mechanic forum, and they will tell you to hit it with your purse .
The method Bob mentioned above also works well sometimes, but you will destroy the bolts if you try to use the factory ones, and will end up with a trip to the dealer to replace .
Good luck