What moves do I have to do and what things do I have to say when I'm filming??
You have to do the riolu kid like usual, and The big monster. These are the correct lines: 1.Over here! M.B.!!! 2.I'll turn you to scrap!!!
This is all the lines.
Moves to use on certain scenes: 1: Slowbro's light screen 2:Slowbro's Sunny Day (Slowbro dies here, use any move) 3:Typhlosion's Overheat 4:Thphlosion's Overheat
This should do it.
Source: http://serebii.net/black2white2/pokestar/thegiantmonster.shtml