http://www.smogon.com/forums/threads/balanced-hackmons.3489849/page-129#post-6592696 "New discovery: Abilities activate before primal reversion. The game hardcodes Kyogre and Groudon to not activate Drizzle and Drought, respectively. This means you can use Intimidate/Download/etc as a starting ability on your Orb Pokemon. Also, not competitively relevant but, Drought activates on Kyogre and Drizzle activates on Groudon before primal reversion." I tested this on PO and Intimidate didn't activate.
https://github.com/po-devs/pokemon-online/commit/d5540c329f0015a560ab6e5bd10f02e3f8b0f47e next update