Replacement?

[NINTONDO[X]CORE]

Ok, my team atm is;
Mothim lvl 35
Vespiquen lvl 35
Empoleon lvl 36
Weavile lvl 36
Luxray lvl 36
Ambipom lvl 37

I'm just coming up to the part where you get Riolu and i want to train it up and replace one of my pokemon with Lucario, which should i replace?
I was thinking either Ambipom or Mothim, especially Ambipom cos it gets hardly any good moves. Should i get rid of any different ones for it? Should i even get Lucario at all?

 

[arceus03]

Get rid of Ambipom. Lucario has higher Att and Sp Att compared to Ambipom, and Ambipom's Def and Sp Def is lower than Lucario. Mothim can be a sweeper, but be careful because its Def and Sp Def are very low >_< At least that's my opinion