I meant it can never appear in Lake Verity and such (I'm 90% sure it can't), not any body of water. I suppose I can fix up the wording somehow.
On Smeargle, to be frank, I don't think it's worth it. It will take a while to get the desired moveset on Smeargle, let alone do all the other stuff (training, breeding) that you would have to do anyway. In the end, all Smeargle really nets you is more variety in moves, but with much worse stats. I understand what you are trying to say - that Smeargle can do a great many things to help you catch the legendaries, but it's really easier in the long run to use something like Gallade.
On Smeargle, to be frank, I don't think it's worth it. It will take a while to get the desired moveset on Smeargle, let alone do all the other stuff (training, breeding) that you would have to do anyway. In the end, all Smeargle really nets you is more variety in moves, but with much worse stats. I understand what you are trying to say - that Smeargle can do a great many things to help you catch the legendaries, but it's really easier in the long run to use something like Gallade.