Pooh's Grand Adventure: The Search for Christopher Robin (1997)

Winnie the Pooh and Christopher Robin are best friends who wish they could be together forever. However Christopher Robin needs to go to school. Christopher Robin has trouble telling Pooh that they will be separated, so he leaves him a note. Pooh, misunderstanding and believing that Christopher Robin has gone to Skull and needs his help launches a rescue mission with the help of Rabbit, Tigger, and Piglet.