To battle Bellmot.
To battle Richter Belmont, first get the Soul of Bat relic.
Then go through the castle to the stairs that you first climb as Richter to face the count.
Once ther you will notice that the stairs have crumbled away.
Turn into the bat(R1) and fly up the used to be stairs. Go through the door to the back of the room. You will see Richter Belmont.
A good idea is to use the resist holy to prevent his special attack from killing you.
Good Luck!!! You'll need it!!!