To start the year 2018, Disney XD will be premiering a Pokemon movie marathon starting at New Years at 10 a.m. sharp. At the beginning of the marathon, Disney XD will premiere the first three Pokemon movies, Pokemon the First Movie, Pokemon the Movie: 2000, and Pokemon the Movie: 3.
The site also mentions that on Jan 2nd, Disney XD will be showing the rest of the movies and TV series all the way to January 19. The marathon on Jan 2nd will begin at 3:30 p.m.. The last and current movie that will conclude the marathon will be Pokemon the Movie: I Choose You!
The end of the marathon will be at January 20 and 21 when they start running encore movies.