Battle Moveset

A Good Moveset for Granbull would have to be this:

Attacks:

Return/Body Slam
Shadow Ball
Earthquake
Iron Tail/Focus Punch/Fire Blast

Items Attached:

Leftovers OR
Choice Band

Preferred Nature:

Adamant OR Brave

Strategy Using Granbull

Granbull is pretty much entirely outranked by Tauros, so the only place you'll see this guy is the UU environment. If, for some unexplainable reason, you choose to use this guy against OUs in place of Tauros, remove the Choice band and give him Fire Blast. A 2KO on Skarmory is a lifesaver for a physical sweeper.

This is just basically a "Generic Normal-typed Physical Sweeper/Choice Band" move set.

-Return basically destroys everything, although Body Slam is nice since the paralysis chance can mess a few things up.
-Shadow Ball gets all those evil Ghosts who don't get hurt by Return/Body Slam as well as doing some excess damage to Psychic types.
-Earthquake is always a must on something like Granbull, since (with the aid of Shadow Ball) it covers everything resistant to Return/Body Slam. Enjoy EQing Aggrons as well ;).

As for your final move:

-Iron Tail works nicely with Choice Band for those weak at prediction. If you can't decide whether a Rock or Ghost type is likely to come in to block your Returns it's always nice to have something that'll get both and a 50% chance of lowering Defence is always favoured.
-Focus Punch is nice for those good with prediction. A base 150 Fighting attack will leave holes in whatever you predicted to switch in.
-Fire Blast is ONLY if you are playing with Granbull in an OU environment. It can 2KO Skarmory with the correct EV distribution and saves you needing a Magneton. This is best played with Leftovers to avoid people manipulating your weak Fire Blast as your permanent move, however the loss of Choice Band boost will hurt when you're stuck against OU Pokémon.

The main good points of Granbull is its trait and Attack stat. Intimidate makes it perfect for Choice Banding, allowing it to switch into Physical sweepers and shrug off the received damage and a huge Attack stat + Choice Band tears things to shreds. Without Choice Band, Granbull's effect is felt stronger in the late game, when the opponent's Pokémon have been weakened and are easy pickings. With Choice Band, it's effect is to turn the tides of the game, getting that well predicted KO and making sure the game is in your favour.

Don't underestimate its hit taking ability but don't overestimate it either. It can take a handful of hits from Underused Pokémon but those defences get torn to pieces in Overused environments.

Against overused Pokémon my suggestion is to exploit the most overused of all, Blissey. She WILL run from Granbull and give it a free turn to launch offence. It can also switch into Skarmorys and Fire Blast them into fleeing, once more setting up free turns. This is the main way it'll survive, since even with the aid of Intimidate, it'll still struggle to take hits.

[For those who don't know, OU means Overused, referring to Pokémon who are found on most standard competitive teams. UU means Underused, referring to the Pokémon people rarely use on a standard competitive team.]

EV Corner:

EVs: 252 Atk / 56 Def / 202 SDef Adamant Nature (+Atk, -SAtk)

Without Fire Blast, I suggest this distribution. 321 HP, 200 Defence (nice with Intimidate) and 206 Special Defence are decent stats at a UU level.

EVs: 124 HP / 252 Atk / 38 Def / 96 SAtk Brave Nature (+Atk, -Spd)

This is for those using Fire Blast, which, with this distribution, will 2KO Skarmory. I've evened out EVs for the use of Leftovers and whatever is left is placed in Defence, which will receive a slight buffer with the aid of Intimidate. It's defensive stats are pretty worthless against OU offence but Intimidate will be your life saver.

Other Optional Sets:

Granbull@Leftovers
Return/Body Slam
Shadow Ball
Heal Bell
Thunder Wave/Reflect

I gave this a try and it is a half decent UU cleric. Intimidate allows it to get into play and buys it a free turn, a turn spent using Heal Bell to aid the rest of its team. The lack of a non-rest Healing move is what hurts this set and total reliance on Wish, which makes it become a predictable for your opponent as to when it'll be in play. You main Focus for this set will be on Special Defence, HP and Defence. Thrown in a bit of attack to even it out at a nice solid number (anywhere between 300-350) so that it can put a hurting on things. Body Slam or Thunder Wave is my advice, since paralysis is a major help with a Speed stat like Granbull's. Reflect is an extra buffer to both Granbull and its team's defence.

Granbull@Leftovers
Body Slam/Return
Bulk up
Taunt
Shadow Ball/Earthquake

Basically, Bulk Up against something that's likely to switch. Hopefully a physical sweeper will come into play and then switch out seeing that you've boosted Defence. Work on your instinct and decide whether your opponent is likely to: Send out a Special Sweeper, Attack with the Physical Sweeper or send in a Hazer or PHazer. If you think a Special Sweeper is on its way in, use an attack and you'll be likely to KO it. A Physical Sweeper depends on whether you can handle it enough for another Bulk Up or not. As for Hazers, Taunt the switch in. With PHazers, Bulk Up on the switch then Taunt their attempt at Roar/Whirlwind. This is entirely reliant on prediction and how well you can manipulate your opponents mind. Granbull can stave off fainting for long enough to mess up entire teams. As for the choice between Shadow Ball and Earthquake, depends on what you want to support Return. They basically both cover the things that Body Slam/Return can't hurt. The EV focus on this set will be in HP and Special Defence with whatever is leftover in Defence or Attack.

Strategy Against Granbull

It's slow, exploit that. A weak Special Defence makes for easy pickings when it comes to Pokémon with good Special offence. Prediction is always your friend, and hitting it on the switch in then once more will most likely be enough for a KO. Even with Intimidate kicking in, strong physical sweepers can get the job done. Focus Punch and STABed Fighting attacks are always welcomed offence.

Contest Moveset

A good Contest Moveset for Granbull would have to be this for the Tough Contest best with Impish, Lax, Relaxed or Bold Nature:

Attacks:

Tackle
Rock slide
Thunderwave
Hyperbeam

Items Attached:

Yellow Scarf

Strategy Using Granbull

If you do the attacks in this following order you should have very few problems; 1st - tackle, 2nd - Rock slide, 3rd - Tackle/Thunderwave, 4th - Rock slide, 5th - Hyperbeam

Locations in Games

Ruby/Sapphire/Emerald Trade from C/E (Ruby/Sapphire) Evolve Snubbull (Emerald) Colosseum Snatched From Cipher Peon Tanie in Shadow Research Institute Fire Red/Leaf Green Trade from C/E

Animé Appearences

Granbull has had a few Animé Appearences. First it was used in a battle against Ash by Lisa, next it evolved from Snubbull and went back to Snubbull's home Movie 3: Spell Of The Unown Episode 177: The Trouble With Snubbull! Short 4: Pikachu's Pikaboo