Tropius is the biggest piece of fruit trash in the game, weak Sp. Def so one Ice cream will cream that shit.
Depending on what kind of player you are (I'm more of a poison/defense guy) you should go by how you attack.
My line up (haven't played B&W) is:
Brozong
Shuckle
Snorlax
Bannette
Charizard
Luxray
If you stick with your team then I recommend:
Swampert - His best trait is his attack, so physical moves should be best plus being water/ground he's only gonna be ****ed by grass, it's not fast and only has semi good HP.
Surf, Earthquake,Ice Punch (Physical + super against ice = more stronger than ice beam, Protect)
Breloom - Fast and a lot of good attack, shitty HP and flying types kill it quick
Mach punch, Stone edge (must have physical attack + kills flying/ice easy), drain punch, any other move you want
**** Tropius.
Absol - Awesome attack, decent speed
Night slash (OP damage for a dark move), Psycho cut (For fighting types), swords dance, X Scissors
Torkoal - One of my fav pokemon, strong defense and attack
Overheat, Iron Defense (must), Gyro ball, Rest
Aggron (when your aron evolves)- Slow as ****, awesome defense, good attack
Ironhead/Iron tail, Any reciol attack (if he has the rock head ability), Stone edge, Earthquake
There you have it. Corr knows alot bout pokemon cause back in the day corr had the squads and shits figured out. >___>