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Two things annoy me about Feebas: There's really no indication anywhere in the game that that's how you find it, and the tiles reset after a certain amount of time in both RSE and DDPt.
I'm all for more involved, difficult ways of encountering rare Pokemon, and I think a set of random tiles on a particular route are a perfectly good way of accomplishing that. But you should be able to search over an extended period of time rather than devote hours to tediously searching tile after tile, and you should have some indication that it's there without looking it up online or buying a strategy guide. Maybe I'm forgetting about a line of dialogue or something, though.