Sometimes the easiest way to be heard is just to speak up. And while most fans can't go to New York, go into Pokémon USA, and tell the people who work there how they feel about this, most fans can write letters and send them to Pokémon USA.
Quite simply, how you can help is by writing a letter to Pokémon USA telling them how you feel about this. This means a hard-copy letter - e-mails can be deleted without a second thought, but letters are harder to ignore. If you'd rather send an e-mail, though, or even send it both ways, their e-mail address is feedback@pokemon.com. After you've written one letter? Write another!
Or, if you want to support this campaign but don't think you can summarize your thoughts as well as you like, check out these premade letters which you can send or even just use as a reference for your own letter:
Send your letters to one or all of the following addresses:
Pokémon USA, Inc.
ATTEN: Animation Director
400 Madison Avenue
21st Floor
New York, NY 10017
United States
Pokémon USA
ATTEN: Animation Director
1177 Avenue of the Americas
New York, NY 10036
Pokémon USA, Inc.
ATTEN: Animation Director
777 108 Ave NE #2000
Bellevue, WA 98004
USA
Or, again, you can e-mail them at feedback@pokemon.com.