Brock

Brock is a Pokemon trainer and Ash's friend Pooh first met Brock along with Ash Misty and Pikachu in Pooh's Adventures of Pokémon: the First Movie.

Trivia:

Brock had his first apeerance as a guest star in Pooh's Adventures of The Secret of NIMH

Brock will join Pooh and his friends on the Pooh's Adventures of STAR WARS saga

Brock will go back in time with Pooh and his friends in Winnie the Pooh Goes Back to the Future

Brock will meet Littlefoot in Pooh's Adventures of The Land Before Time II: The Great Valley Adventure

Brock will join Pooh and his friends in Winnie the Pooh Meets 3 Ninjas

Brock will join Pooh and his friends in Pooh's Adventures of The Karate Kid, Part II