Yes, Lugia is spike bait to a lot of Pokemon, most walls are anyway. But is it really C-rank? Deoxy-D without spike is completely outclass by Lugia. Also, Lugia WALLS Ekiller, Ho-oh, most Lati@s, Garchomp, Palkia, Dialga, Rayquaza, Reshiram, Giratina-o among others. And I wouldn't use Ho-oh to beat Lugia due to Sacred Fire's low PPs and the risk of burning Lugia (a burned Lugia cannot be poison, the best way to deal with Lugia). Also, now with Multiscale, although very hard to utilize, can be activated via roost and can allow Lugia to take very powerful hits. I would say Lugia for mid B at the least.