Then you have to ask Jibaku why he put Groudon ahead of Lugia and Giratina as walls. Well Giratina has a nasty Dragon-type weakness which is horrible, although the resistances help a lot. To be fair both Kyogre and Giratina lack reliable recovery too, as they have to depend on Rest.
Most balanced teams still love Groudon more than Lugia though because Groudon can still hit decently hard, stops Spikes users and kills Rapid Spinners.
Let's just say Groudon is a physical tank that provides a lot of support to most teams, more than Lugia can. In terms of pure walling and phazing, Lugia is usually better :)
<&GreatSage> if nothing else it's a "trickroom teaches pokemon" thread
<&GreatSage> which is reason enough to keep it
<@Colonel_M> I once heard Jibaku considered Scarf Gyarados for his Ubers team
<syrim> Trickroom the ultimate synguuest