So true...
At least he have good Movepool,Many resistances...
You could use him for Sandstorm team support...
Stealth Rock,Toxic ,Roar...
But do it better...

Then which ground, steel or rock pokemon should I put in my team

is a good one...
You can have sand stream,stealth Rock and Physical wall all in one poke...
And he can deal with 4x weak to ice with ice fang.

Do you have any other sugestions (bcuz i alredy hav im on my team)

Looks like your ideais to make an Sandstrorm based team,right?
So a can help too...
I'm to lazy this morning so i gonna post a link to smogon...
where you can see stats,movesets,strategy,modus operandi,Etc...
Click Here!
I would recomend SpecsLuke...
Since your team will need an counter against ...

i'm surprised no one has mentioned a rock polish on either of them...

Rock polish on Rampardos is really feirce
rock polish on Rhyperior is also scary

I would go with rhyperior....It's defense are high enough to take a hit or two from a super effective hit...and if you are pairing it with sandstorm it should most likely survive another special attack as well...
here's the set for Rhyperior

Rhyperior@Life orb/Leftovers
252 Attack 252 Speed 6 special Defense
Stone Edge
EQ
Ice Fang/Megahorn
Rock polish

I prefer go with icefang, because then the only thing taht can wall you is a brozong who really cant do much to you anyways...Rampardos is good...but first priority moves rape him, or one attack can really OHKO him...rhyperior is just more studier and a better move pool with STAB EQ..and ice fang and Megahorn...lol dont underestimate a 140 base attack...that's pretty damn high

Rampardos after a Rock Polish would outspeed a lot including most choice scarfers, but the trying to get one in is pretty much asking for a dead rock.

Rhyperior, even at a positive and max speed, will outspeed everything non-scarfed. That means that scarfed Heracrosses and other fighters, and even an Agilgross, can still outspeed it. I know his defenses are impressive, but I'm not sure if Rhyperior can live through 2 STABed, supereffective Close Combats and Meteor Mashes. I can say that Rhyperior has more than enough defenses to get in a Rock Polish, but it's unfortunate that it needs to get into 2 of them to guarantee a sweep. Not to mention that you'll be forgoing an attack for Rock Polish, lowering your type coverage.

thanx for the site Bushin. ive dcided to go with:
a good sturdy wall
has sand stream + good attack
plays well with ttar + good attack & speed
/ (good hp and alredy ev trained so might as well, what do you guys think?)
one of my faves & has good special attack
or any water or ice type. what do you guys think?
Please tell me if you have any other suggestions

True... but the type coverage thing shouldnt be that much of a problem...maybe..like ice fang and EQ provide alot and then stone edge as well...but the unfortunate thing about stone edge is it's accuracy and sweepers can never offord to miss...to switch him in though, it'll have to be on like a pokemon that's already in a choice move that cant do that much damage..or a weavile...a weavile defintely 3HKOs rhyperior even though it has a super effective ice punch...Rhyperior's defense + his ability...makes it hard for weavile to do much damage even with no EVS in HP and Defense...your right rhyperior cant live though two super effective meteor mashes and close combats...however an already sped up rhyperior can probably OHKO a metagross with EQ(lol a guess, not lookin up damage calc) and we can tell one thing about the metagross since it would be an Agiligross..it has max Speed and max Attack...so not much in defense( not unless the person did apply in some) Rhyperior high 140 attack EQ can really OHKO it...

I trained both ramparados and rhyperior. I say rhyperior is better then ramparados but, he is not a bad pokemon. I also say tyranitar is better then both of them.

I would Recommend Rhyperior,He lasts longer than rampardos,and his two four time weaknesses(Grass,Water)wont matter because the damage from both types are halved by Solid rock,and the other types that are super effective to him(Ice,Fighting,Steel)get their damage halved as well,and Rhyperior could be used as a supporting pokemon as well.Rampardos is just plain terrible,the only thing that prevents him from going into Under-Used Tier(UU)is his ability;Mold Breaker,which lets Rampardos attack no matter what there ability is (e.g.he could Use EarthQuake on pokemon who have Levitate,incase you didnt know.)But Overall Rhyperior is better.

is definately the better. It can learn Dragon Dance which adds to its hight attack and gives it average speed allowing it to outrun some things. Plus sandstream which gives it's Sp. Defense a 1.5X boost.