Seeing how the previous Animation director thread has been locked (hopefully this new one's okay), and the old storyboarder thread was sorely neglected partly due to being separate from the animation one, I've decided we may as well start with a clean slate for Best Wishes. Per Sombra29's suggestion, this will cover both storyboard artists and animation directors, as well as screenwriters (Tomioka, Takegami, etc.).
I may edit this later with a description of each person, but for now I'll just post the staff info for BW 1-4:
BW001 - To the Isshu Region! Zekrom's Shadow!!
Screenplay - Atsuhiro Tomioka
Storyboard - Norihiko Sudō
Assistant Director - Masaru Koyama
Animation Director - Izumi Shimura
BW002 - Iris and Kibago!
Screenplay - Shinzō Fujita
Storyboard - Takaomi Kanezaki
Assistant Director 矢嶋哲生 Tetsuo Yajima
Animation Director - Tomohiro Koyama
BW003 - Mijumaru! Meguroko! Close Call!!
Screenplay - Hideki Sonoda
Storyboard - Hitoyuki Matsui
Assistant Director - 山崎友正 Tomomasa Yamazaki
Animation Director - 池田志乃 Shino Ikeda
BW004 - Battle Club! Mysterious Pokémon Appears!!
Screenplay - Junki Takegami
Storyboard - Masaru Koyama
Assistant Director - 牧野吉高 Yoshitaka Makino
Animation Director - 篠原隆 Takashi Shinohara
I noticed some new names, including new animation directors for the latter two episodes and new episode directors for all but the first one. Best Wishes is also the third consecutive series to have Izumi Shimura as animation director for its first episode; Get the Show on the Road and Following A Maiden's Voyage! also had Shimura in charge of the animation.
It also appears that Hideki Sonoda has written his first TV episode in four years; his last one was the final episode of Advanced Generation.