sorry for being late XD I forgot this!!
At the end, I decided to make a sunny day team, don't know why. Maybe 'cause I love jumpluff XD
This is my team:
Jumpluff with max speed and sp attack. It has sunny day, solar beam, sleep powder and memento (I just want it to set up the sun) and has heat rock.
Her partner is a camerupt with leftovers and max speed with rock polish. It can take hits (I've tested this team twice) and has EQ, lava plume and solar beam.
Then I have a flareon, wich is a wall, but I've just realised I didn't give it EVs (that's why it didn't take hits too well). If I have flareon and camerupt I can take advantage of flash fire. It has heal bell, protect, wish and lava plume.
Then I have cherrim, wich raises 50% attack, and sp attack of herself and her partner in sun.
It has solar beam, weatherball, sinthesis and protect. I have a muk, with sunny day, fire punch, poison jab and pain split and a golduck with cloud nine (just in case someone tries to take advantage from my own sun) with surf, ice beam, hidden power electric and signal beam.
I still think I need to change something, but I got good results with this :S
PS: you like death note! cool!
PS2: when was the tourney? 10PM in your country or in mine?