Finally, after over 1700 eggs, and two non-HA (but still viable) shinies, I got myself a shiny, HA Shroomish. Jolly nature, egg moves Focus Punch, Drain Punch, Seed Bomb, and Bullet Seed, IV's: 24/31/31/31/31/31. I nicknamed her Sriracha, and her siblings, Doomshroom and Nuke are going to be my Poison Heal stallers with a slightly different moveset for each! Next hunt: shiny Riolu!