Ok, well I'm one that likes to think creatively and give crappier pokemon a chance so I'll probably post a lot in this thread, but I might ask for some suggestions on EVs as I'm still not a master at making my own spreads. Ok, well here I go.
Pokemon: Pupitar
Name: Curse-Tar...Pupa Style!
Move 1: Curse
Move 2: Earthquake
Move 3: Rest
Move 4: Stone Edge
Item: Leftovers
Ablity: Shed Skin
Nature: Adamant (+Atk, -SAtk)
EVs: 156 HP/160 Atk/96 Def/96 SDef
Now, this guy may not look very good at first, but he does in fact have 2 things over his full evolution. Those 2 things being a STABed Earthquake and the ability to abuse Shed Skin with Rest. Curse works very well with Rest, as it pumps up his defense so that he can live through the Rest. Now, with Shed Skin, it has a 30% chance of shedding off the Rest. This also means that he can wake up right away so he can start attacking right after.
You may be wondering why I didn't pump up the speed and just give it Dragon Dance instead. The reason I gave it Curse as opposed to Dragon Dance is that I'm trying to abuse Shed Skin, and Pupitar is going to have a hard time living through a Rest without the defense boosts from Curse. The speed drop honestly doesn't matter either with its 51 base speed.
This EV spread gives it 320 HP for nice leftovers recovery, and 200 for both defenses while still retaining a respectable 268 attack. This EV spread seems pretty solid, but one thing I am not sure of is if it would be ideal to pump up its Special Defense so that when it curses up, it can take hits well from both ends of the offensive spectrum.
Every set has its problems however...being a Rock/Ground does give some useful resistances, but this is no Rhyperior, and therefore no Solid Rock. This means that any Water/Grass attack will almost always mean a OHKO unless it's something like Bubble, or if it's already gotten a Curse off. However, in a sandstorm from big bro/sis T-Tar, it can take a 4x weakness as its sp.def will be boosted up to 300 after that. If it's really important to you, you can move 4 EVs from either Defense or Special Defense so that once it gets off 1 curse, it will have the same attack as a 252 Atk EV +Atk Nature Tyranitar (403 attack). After that, all calculations that apply to Tyranitar will be pretty much the same for Pupitar with Stone Edge, but will all be considerably higher with Earthquake.
Just remember when using this set if you wanted to alter it in any way or something if for some reason you wanted to use it, that Shed Skin and a STAB Earthquake are the 2 things that it has that Tyranitar doesn't. Abuse those and you should be fine.
I might post another set sometime, this is a great thread and does help clear up the clutter. :]