I've always wondered what the characters kept in their backpacks other than their Pokeballs(with the exception of Ash and Brock who keep them on their belts). This is all I know about each character's backpacks:Ash(probably most known):
-A Rope(Hoenn on, pretty sure, probably based off the escape rope from the game)
-Pink Gloves(Ever since first episode, used them when Pikachu was angry at him in first ep and when Pikachu had a fever in a later ep) Read More...
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Route 111 (desert, optional) With the Go-Goggles, you can finally venture into the windswept desert on Route 111. The powerful sandstorm deters most would-be explorers, so no one has yet claimed the valuable treasures lying among the dunes. Trainers Trainer Pokémon Desert (requires Go-Goggles) Rematch Trainers with a PokéNav by their names will be registered in the Trainer's Eyes or Match Call function after the first battle, and may have a rematch with the player with higher-level Pokémon. Read More...