I'm sorry, but don't even try comparing Granbull to Metagross, much less Groudon. It's simply not in the same league. If you want to make a bulky Granbull, you'll have to sacrifice attack stats while I can make a bulky Metagross capable of surviving Slakings Earthquakes with 405 attack. Metagross also has a way better type combination with loads of resistances, a higher attack stat, better speed, and with proper EV investments Metagross can come in Skarmory territory on physical bulk (apart from the EQ weakness and the lack of a recovery move).
Originally Posted by Blue Harvest
As a supporter it simply isn't built like one. It has the moves, but not the stats. It's too slow to support effectively, and defensively too frail. If your foe switches after they got intimidated their new pokémon doesn't have the lowered attack, so your bulk is gone, while on pokémon with the stats (like Metagross) the bulk stays. If I want a supporting normal type, I could get Blissey, who also gets Heal Bell and Thunder Wave, but way more defensive power.
In physical vs physical battles it may have the Intimidate advantage over Ursaring, but it still is no match for heavier ones out there, like Metagross, Salamence, Tyranitar, and so on. It's just in an entirely different league, and super fang isn't going to make up for that. In the lower tiers a Choice Banded Mega Kick or Double Edge will usually hurt a lot more than Super Fang will, especially later in the battle. Super Fang is fun if you are defensive and lack offence, but for an offensive slow glass cannon like Granbull it simply doesn't work as it doesn't KO, thus allowing your foe to set up, or just outright kill you.
Master balls are the cheapest thing ever invented. It's more fun catching everything with balls that can fail. 'caught Latios in the wild without master ball ftw'