Pokemon ORAS will launch a battle competition with pokemon from gen 1 and 2 can compete only, here are the rules and stuff. Note you have to compete in 3 battles to get the Entry Gift.
Region: International
Registration Period: May 19th 2016 - May 26th 2016
Battle Period: May 27th 2016 - May 29th 2016
Battle Type: Single Battle
Battle Limits: 15 Battles per day
Pokémon Restrictions: National Pokédex #001-#251.
Banned Pokémon:Mewtwo, Mew, Lugia, Ho-Oh, Celebi. Pokémon #252 - 721
Banned Items: Mega Stones
Entry Gift: Witney's Miltank, which has the ability Scrappy and has the moves Rollout, Attract, Stomp and Milk Drink