It has to be from a region first so I'll go first.

Kanto

Adam McArthur - Red
Danny Cooksey - Blue
Briana White - Leaf
Maurice LaMarche - Professor Oak
Jason Spisak - Bill
Mark Whitten - Brock
Georgie Kidder - Misty
Patrick Warburton - Lt. Surge
Charlet Chung - Erika
Matthew Yang King - Koga
Jenny Lorenzo - Sabrina
Charlie Adler - Blane
Anson Mount - Giovanni
Courtneay Taylor - Lorelei
Bruce Thomas - Bruno
Candi Milo - Agatha
Wally Wingert - Lance
Lex Lang - James
Sandy Fox - Jesse
Dana Snyder - Meowth