Question: oras is groudon shiny locked?
Answer: Yes, Groudon along with Kyogre, Rayquaza and Deoxys are thought to be the only Pokémon Shiny Locked in ORAS. The rest of the Legendary Pokémon you can apparently get shiny, including Zekrom and Reshiram, which could not be obtained shiny prior to ORAS, unless by hacking.