Awesome Zorua is still awesome when shiny maybe try a random encounter now could be by fishing or by cave/grass. You could try for a specific type of pokemon maybe a cool psychic type or electric ^^ .
Yes I really want an RE shiny because I haven't gotten one in the 8 years I've been playing lol. It's kind of sad actually, maybe I just have bad luck with RE shinies.
I once tried to SR Kyurem but I got bored after ~20 SRs but somehow I have the patience to MM. Hmm...