1st Encounter: Here you will be mostly using strong attacks against him while dodging his attacks. When he jumps up above in the dark, use the spot lights to automatically shine them on him (as long as he is close in that area). You will do some auto-attacks on him. Repeat until he is defeated.
Final Encounter: This battle is a lot like the first one. Shoot web at him to make him drop his moltovs when he is throwing them, if they hit under him he can be damaged a lot. Follow him around keeping your Spider-Sense on. Use the spot light when you can, and you will have to find him as he runs away. Attack him with strong attacks. When he starts attacking you, roll out of the way and attack.