Hiding the Facebook comment will keep it hidden from everyone except that person and their friends. Deleting the Facebook comment will erase it; no one will be able to see it. The user will know that the negative comment has been deleted if they go to view it again, but they won’t be notified of its deletion.
You need to reformat the cards as FAT, then put them both in the adapter, then plug the adapter in, then format the cards from the PSP itself. If that doesn’t work, try deleting the partition on each card, repartitioning them, don’t format them, then put them both in the adapter and format it in the PSP.
Though they do spawn in the wild, early reports suggest they are rare (though this might be partly due to a visual bug for some players) – but thankfully, they can also be found in several other ways while the event is active. You can find Skrelp and Clauncher during the Rivals’ Week event by: Finding them in the wild.