What would you change from my team?

First time playing Platinum. I tried making a good team but limited by my only weakness as a pokemon player. I only like to use cool or cute pokemons. So far I'm in celestic town and my team is: Empoleon Gallade Roselia ---> Roserade soon Straptor ----> I'm going to change it for Togekiss Gabile ----> in it's way to Garchomp in time HM Slave ----> to be replaced with frosslass eventually

What would you change? I tried having a widespread defence and offense STAB-wise. I know there are better pokemon in the game. But without any offense to someone... They are pretty ugly (mamoswine, the evolution to gliscor) If someone knows of a cute or cool pokemon who could replace someone in my team (Empoleon preferably) let me know.