User blog comment:Artemis Paradox/The Official Monster Hunter Wikia Help Blog/@comment-4427130-20111019211217/@comment-969093-20111026092148

You could use the wall if you desperately want to get some easy hits. But even wall'ing him isn't 100% save. Unless you stagger him while he's stuck he'll horn-uppercut his way out and deal considerable damage to whoever is near. To make it worse, you're near a wall. Worst of all, in a corner. Wall + Corner + Pissed of Alatreon + MH being MH = inb4fail.

Don't rely on the wall. If the team is scattered and there is no coordination the plan will, in fact, backfire and waste valuable seconds or even minutes. Learn to Hammer him properly and ditch wall'ing. It's a tactic for cheap noobs who lack what it takes to be a real monster hunter.

Also, you can try to apply Turn-SP on his head, but in MH3 the positioning and timing are very hard. Don't bother until you're experienced at fighting him. In MHP3rd this has become much easier though and everyone with some decent sense of pounding can pull it off.