So first I got a shiny Oddish while looking for a pidgeotto to fill the pokedex, AND NOW I GOT A SHINY VENOMOTH WHILE LOOKING FOR A TAUROS OR A KANGASKHAN AS A NEW TEAM MEMBER.
I found two shinies, while looking for different pokemon, that were BOTH POISON TYPE, IN THE SAME WEEK AND AT 1/8192 ODDS.