Monster Cards: just proceed to the last labyrinth and fight siren soldiers. There are plenty around, so you should be able to easily get the last card.
End Boss: save is right before end boss with maxed out healing items. I collected all the hearts, but never upgraded health and all items are collected for 100%.
Hopefully these help a bit.
Forgot the link. Here it is:
You must login or register to view this content.