someone told me to ask in here, so which pokemon would be used best for competitive battling in a team of 6?
Salamence
Dusknoir
Electivre
Jolteon
Rhyperior
Metagross
Golem
Milotic
Lugia
Camerupt
Tyranitar
Cresselia
Zapdos
Ho oh
Just which ones out of those and i didnt wanna post in the moveset thread because i dont need help with that i just need help making a team out of all of those.
Of the ones you suggested,
Sal, Dusk, Elec, Jolt, Rhy, Meta, Milo, Tyra, Cres, and Zap are OU (overused).
This means they are used often in the competitive metagame. They are generally good at doing what they do and outclass most other things.
Golem and Camerupt fall under the UU/NU (underused/never used) category, which means that they generally suck compared to other Pokemon. Golem is completely outclassed by some higher ups, like Rhyperior. Camerupt is NU, meaning that you will scarcely see it in battle. Camerupt does have its merits in Lava Plume and unique typing, but it will get creamed in OU play.
Ho-Oh and Lugia are UBER, meaning that if you as much as include either in your team, your team will face off against FULL UBER teams, no matter how many OU you have. Ubers have superior stats and better attacks, which means everything basically falls against it.
Now, the second thing you want to do is balance out your weaknesses and resistances:
https://pokemon.marriland.com/diamond_pearl/team_builder/
Then, you want to make movesets for them. If you need help, here is inspiration:
https://www.smogon.com/dp/pokemon/
Then the next best thing to do is test it on Shoddy, which I fail to have a link of and CBF to find because this post is abominably long.