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http://bulbapedia.bulbagarden.net/wiki/Tyranitar_(...

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Tyranitar is not meant to be a Sweeper. He can be either a Physical Wall or a Mixed Wall. He also has High Attack. So... the nature I recommend is Brave. He won't need Speed anyway, like I said.

And if you want my recommendation on a particular Move set, here you go:

-Crunch

-Earthquake

-Ice Fang

-Substitute

Reason for this is because he is slow. This move set guarantees that you will be able to attack anything without being told "It's not very effective". Plus, since Tyranitar has high Defenses, he can take a hit or two before his Sub runs out. Or at least it will protect him from getting knocked out in one hit from something like a Fighting-type move.

Best Nature For Tyranitar

Well.............. that depends on what you want it to do. adament is probaly the most standard of all, but some can even be Jolly for Speed. However that is if have it for "certain" situations......I suppose naughty might not be so bad since its Ability causes sandstorms, and sand raises its Special Defense which would pretty much make up for it. Modest could be a surprise to see in battle because it does have a great move pool there! I wouldn't recommend brave to often becuse it is slow, but it definitely can out speed other "heavy hitters".

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RE:

Best natures for tyranitar pokemon heartgold?

I am going to ev train a tyranitar and was breeding for a good nature but it is really hard to get an adamant nature so i was wondering what other nature would be good for it? I have a modest nature larvitar (+sp att, -att), brave (+att, -spd), and a naughty(+att, -sp def). Please let me know if...

tyranitar's 4x weakness to fighting ruins his chance to be a complete tank but your ev's are good though you could give 252 to hp and 6 to defense if you want but thats up to you. and as for a moveset i believe aerial ace is a must have to deal with fighting types since if a trainer as one then thats what they will use agianst him, then stealth rock is a great move but you'd probably be better off giving that move to your lead and tyranitar aint a lead pokemon id suggest swampert for that job. since your going to want crunch and stone-edge for stab if you want to keep earthquake i would suggest giving stealth rock to someone else since you only need one pokemon with that move.