First have the taunt sub-weapon on Jonathon and make sure Charlotte has sanctuary spell on her, also make sure to have lots of high potions go to the the room(make sure to save first) go in skip dialogue get near Loretta and and Stella and make Charlotte use sanctuary then as shes casting sanctuary use taunt move away from Charlotte but keep her on screen at all times or she will disappear and you will have to do it all over again now when it's done casting you will win the battle.
If you decide to kill them you will get the bad ending Brauner will get away with Loretta and Stella in his painting he will than destroy draculas castle will be destroyed and you will chase but it will automatically give you Game Over and you will be sent back to the last save point with everything you had before just like the battle never happened.
Once you have beaten the game, go down into Death's Pass. At the bottom, you face a Doppelganger of yourself or your partner. Use the subweapon that you wish to upgrade on the Doppelganger at least once. Do not use anymore subweapons after this. This will screw up the process. Defeat the Doppelganger, and you will get roughly 250 AP. This is quite a bit compared to most others. In order to fight the Doppelganger again, you must leave Death's Pass and come back. I recommend giving your characters the worst equipment as you walk in the room with the Doppelganger, as the Doppelganger uses your current equipment against you.
To defeat Dagon, the boss of the second school looking portrait you must have obtained the Dark Rift spell from Vincent. When Dagon sucks in all the water then is about to spt it out cast dark rift and all the water will be sucked right in to the black hole and no damge will have been done to you. From there just repeat that and be sure to use the Rose Stem Whip because although that is not what it says he is weak to and it's not a very good weapon for some reason does pretty good damage to him.
Heres how to get the most powerful weapon in the game. It's simple really, after some unknown amount of time just talk to Vincent and you can buy it from him for like 30,000 or so dollars. I know it's alot to pay but it's worth it, but I use Action Replay so it was easy for me, but if you don't have an Action Replay then my only advice to you is to break a butt load of lights and candles.
Listen closly. After you use the sactuary spell on the vampire sisters, they will allow you to make the Vampire Killer stronger. But in return, you must kill Ricter Belmont, the Whip's Memory. Buy many healing items, because this battle will take a long time. Also, you should still have the Nebula whip. Use that weapon to attack him. Also, his attacks can send your HP to the bottom. Memorize them and kill him.
Go to the area around the portrait for Nation of fools. There are 3 gunmen there, and a save room above them. Kill them and go to the save room. Return to the gunmen and do it over again. Also, there is a hidden room in this area. Use an axe or the bible to unblock it. You have to find it on your own!!!
There is a way to get easy money, plus easy pudding buckets(almost the same as high potion). Use the teleporter to go near the Sandy Grave portrait.As soon as you exit the teleporter room, there should be some Persephones there with vaccuum things. Kill them, and they will drop Frilly Casimoles and pudding buckets. Keep the pudding buckets as food, but you should collect 9 Frilly Casimoles before you sell them. They are a common drop, so you should get 9 in 10 minuites or so. If you sell them, they are worth $2450 each, so selling 9 of them at once gets you 20k or more in just 10 min!