The official Pokémon movie website has updated. Translations of the new entry follows:

Abareru-kun Becomes a Movie Voice Actor! He Will Be Playing "Onigohri"!!

Abareru-kun is well known from the "Pokémon no Uchi Atsumaru?" show airing on the TV Tokyo Network, among other things!
In one of the segments on the show, he has been been putting in extreme effort on a daily basis for the purpose of becoming a Pokémon movie voice actor, and now he has finally succeeded!

For about two months, Abareru-kun studied voice acting, including being taught the basics and know-how of voice acting by Satoshi's voice actor Rica Matsumoto, before shockingly going directly to director Kunihiko Yuyama himself! The director was touched by Abareru-kun's dedication and okayed an appearance in the movie as a special favor to him!



Abareru-kun will be playing the voice of "Onigohri"!
Onigohri is one of the members of the "Mega Evolution Army" led by "Azoth Kingdom"'s Cabinet Minister Jarvis, who acts as Satoshi and his friend's antagonist. This Onigohri is being mind controlled through the use of incredible scientific power and is also forced to mega evolve. How will Abareru-kun play this role!?

The announcement that he was going to be a guest voice actor was made as a complete surprise to him, and can be seen on the episode of "Pokémon no Uchi Atsumaru?" that airs Sunday May 22nd!
"Pokémon no Uchi Atsumaru?" airs every Sunday at 8am on the TV Tokyo Network!

For a list of the guest voice actors, see the Cast page

Source: http://www.pokemon-movie.jp/news/?p=2082