The official Japanese Movie 20 website has updated with information on the annual movie drawing contest. Translations follow:

Aim to Become a Pokémon Drawing Master! The "Pocket Monsters the Movie: I Choose You!" Drawing Contest

Organizer: 10 Shogakukan magazines
Sponsor: Pikachu Project

We're commissioning your Pokémon drawings!
Color in the Pikachu on the drawing form, draw whatever Pokémon and other pictures you want around it, and send it in!

Celebrities are participating as well!
To commemorate the 20th movie,
lots of celebrities are entering the drawing contest this year!
We will present their artwork here on this page!

The Pokémon Drawing Master Prize (1 winner, chosen from the 10 Grand Prize winners)


We will create promotional material for the movie with designs based on your drawing!
Your drawing might be used to promote the movie all over the place!

The Grand Prize (1 winner from each of the 10 magazines, for a total of 10 winners)


*A "Pocket Monsters Sun/Moon Light Blue" Nintendo 2DS + one 3DS "Pokémon" game of your choice
This Nintendo 2DS is a product sold by select stores as a limited product. It may no longer be on sale in stores.
This Nintendo 2DS does not come with the 3DS games "Pocket Monsters Sun" or "Pocket Monsters Moon".
Prize provided by: Pokémon

*Your drawing and your name will be presented in the movie!

The Runner-Up Prize (5 winners from each magazine)


*A Monster Collection Extra: Pikachu Special Set
Please note that this prize is subject to change.
Prize provided by: Takara Tomy

The Lucky Prize (100 winners from each magazine)


*2 of each of the Pocket Monsters Card Game Sun & Moon booster packs "Islands Waiting for You" and "Moonlight of Alola"
Each pack contains 5 cards. The cards are put in at random.
Prize provided by: Pokémon

The Pokémon with You Prize (1 winner from all 10 magazines)


*The winning drawing will be used (for a limited time) as the headmark on a train that will actually run in the Tohoku region.

*Your drawing and your name will be presented in the movie!

For info on the Pokémon with You Train



There are two types of drawing forms.

Form A is included with "Corocoro Comic" and "Shonen Sunday".
Form B is included with "Pokémon Fan", "Kindergartener Magazine", "First Grader Magazine", "TV-kun", "Ciao", "Corocoro Ichiban!" and "Pucchigumi"

You can also apply via "Sunday Web Every"!
If you use "Sunday Web Every", you'll draw completely freeform and can submit your drawing via the Internet!
We start taking such entries March 15th!! A link will be provided!

Submit your entry via these children's magazines from Shogakukan:

Submission rules (read through these with an adult):
Cut out the application form from one of these magazines or download one and print it out, fill in all necessary fields, then send it in:
The submissions must have arrived by Saturday April 15th

Pokémon Fan issue 52, on sale February 20th
Corocoro Ichiban April issue, on sale February 21st
Kindergartener April issue, on sale March 1st
First Grader April issue, on sale March 1st
TV-kun April issue, on sale March 1st
Ciao April issue, on sale March 3rd
Corocoro Comic April issue, on sale March 15th
Pucchigumi April issue, on sale March 15th
Shonen Sunday issue 16/2017, on sale March 15th

Source: http://www.pokemon-movie.jp/illust_contest/