Putting helping hand on Cresselia, not sure whether to have it for Meowstic as well though.. Also, not sure which attacking moves for these two. Well, for meowstic it's either psychic or psyshock. Don't know which though. Psyshock seems to be more popular. But, are there more special or physical pokemon in VGC?
I sorted Camerupt anyway - I adapted a set Fire Hero sent to me on Skype.
[Insert Mega-Camerupt sprite here]
Solid Rock --> Sheer Force
Quiet Nature (+SpA -Spe)
248 HP/252 SpA/8 SpD
~ Earth Power
~ Hidden Power Grass
So, I chose Solid Rock because it seemed the most useful out of the abilities it had. That said, it will have Sheer Force when it mega evolves so it won't be too important.
For the nature I chose quiet over modest (what showdown suggested) because if i'm using camerupt for a trick room team I want to have as little speed as possible. Modest raises special attack, so I went for that stat being boosted, and speed being lowered. The EVs were smogon's suggested set.
Moveset is based off what Fire Hero suggested. Eruption works well in trick room, is a STAB, and hits both opponents which is good in doubles. Protect is apparently very useful in doubles, so hey I added it. Earth power is a ground type STAB. Doesn't hit both opponents, but eh, it was suggested. HP grass was originally HP ice, but I didn't really get why, so I replaced with grass because It covers camerupt's two weaknesses.
So? Is this actually okay?
EDIT: Mega Camerupt sprite didn't work UGh. Oh well.