Suffix, I'm well aware of the fact that Regigigas isn't very good. But I still don't have WFC access (something that may be fixed very soon, depending on if my brother actually plays Pearl or not), and if I have the three golems, my brother doesn't have a chance of getting him, because there's no way I'm trading him 3 legendaries unless he's giving me something good (which he won't be able to until late in the game, because his FireRed guys will get me the earlier legendaries).
N64 Chick, from what I've heard, the insane amount of extra stuff in Emerald, plus the fact that you can catch Groudon and Kyogre, means that you really shouldn't care about Zangoose.