Until November 30th, Pokemon fans will be able to vote for one of the 493 pre-Unova Pokemon that they want to appear in the Dream World; if the Pokemon has a Hidden Ability, it will come with it (such as Ditto with Imposter, which means you should vote for a Pokemon that will greatly benefit from its Hidden Ability!). The winning Pokemon will be announced on December 13th and the distribution will take place later from February 1st to February 29th. Until the voting ends, the rankings will be updated every Tuesday so players can see who is winning!
This same contest was already held in Japan and Korea earlier this year in which the winners were Arceus and Rayquaza, respectively. Currently, another Dream World contest is taking place in Japan in which players can vote for one of the main series games’ mascots to appear in the Dream World (Charizard, Blastoise, Venusaur, Pikachu, Ho-Oh, Lugia, Suicune, Kyogre, Groudon, Rayquaza, Dialga, Palkia, Giratina, Reshiram, and Zekrom). The voting for that takes place from November 12th to December 25th and the winning version mascot will be distributed from February 10th to the 27th.