Originally Posted by plusle and minun
Shut up! you're mean!
Ignore the meanies...
Eitherways, you have Sableye, Wailord and Breloom right? Lucy uses Seviper, Milotic and Shuckle. In a way, you have a Pokemon that wins them, for example;
Sableye > Seviper
Wailord > Shuckle
Breloom > Milotic.
However, your given movesets prevent you so. Personally, Sableye, Breloom and Wailord don't help each other much, as they all have low Defenses.
I would suggest firstly, are you sure you want to use these? I think you should swap Sableye with a Pokemon capable of dealing good damage, like a Ground-type? I personally suggest Flygon as it has good resistances against Seviper.
Next, Breloom could stay, but I suggest using a more Special attack oriented Grass type. Roselia is an average choice if you are desperate. However I suggest Vileplume or Bellosom. Best of all, if you have Sceptile... use it.
Wailord is a bit... meh. It has low defenses, in both Special and Physical. If you need a water Pokemon, I suggest Ludicolo. If not, you might want to train up Lanturn or Gorebyss.
I am not that great of a Pokemon team suggester, but I believe the above might help, even a little. ^_^