Look, it's not hard for you to find its attack list, so I won't even bother. I will, however, give highlights of its best learnable attacks through levelup and TM/HM.
Fake Out is great for Lombre, it always its first, and it always makes the opponent flinch, so it's a great move for a cheap first attack.
Get Surf on Lombre to compliment that acceptable Special Attack. It's strong, too!
Get Energy Ball on Lombre too. It gets STAB, just like Surf, uses its Special Attack, and has a chance of lowering Special Defense, resulting in better attacking.
Finally put Ice Beam on it, for straightforward power and coverage.