Advice for my team please? and thank you

While FireWOLF is right that you can beat the game with just one extremely powerful pokemon, awesomeknight is right that it is a good idea to balance out your team. If you train all pokemon equally then you have the advantage in fights where your main pokemon is resisted by the opponents pokemon. Keep in mind that it will be a lot easier, and less boring, to train a whole team of pokemon from level 30 to level 60(at which point you will have a good chance against the E4) then it is to train 2 pokemon(and you will most likely need 2 unless you train 1 to level 100) to level 80-90, the level at which you will need most pokemon to be at in order to easily sweep the E4 with just 1-2.
What you should do is continue to train your pokemon as you go through the game, and when HMs that are useful in battles(such as Waterfall on Floatzel) become available then teach them to you pokemon. Other than that, you should be able to get a powerful team simply by teaching them level up moves. All of your pokemon, with the exception of maybe Stunky/Skuntank, are powerful pokemon. If possible you should try to evolve Haunter in to Ghengar, because Ghengar is possibly the best non-legendary(and maybe even including legendaries) ghost type pokemon in the game.

Best of luck with the rest of the game, and post something else if you want help with current/final movesets.