I Literately just found two shinies in a row a shiny garbage guy and shiny Wurmple IN A ROW

[Hadia 0]

I just began playing AND that

[Kenneth 42]

Both Reborn and Rejuvenation, have a high chance to encounter shinies. They are way more common, than in official pokemon games. And all of them are even custom made artwork. Some Reborn exclusive shinies are simply gorgeous! My favorites are Vivillon, Venomoth, Charizard, Metagross and Tyranitar.

 

When you start breeding for stats, breed a lot, so you can get a proper mon in shiny form. Those are all the rage!

[Lucifer Morningstar 39]

Sorry to rain on your parade but as Kenneth said, shinies are practically a commonality in Reborn (and good to know it's the same in Rejuv as well, I still need to start that game). 
My game is roughly 40%-50% shinies both caught and bred. 

 

Most of the Reborn exclusive shiny coloration are so gorgeous I wish they were canon such as Dustox, Drapion and Shinx. 

[ToDie 7]

Well, finding two shinies in a row without shiny charm is more unlikely than one shiny in gen 2.