Naruto and Pikachu would be an interesting pairing. Naruto's high energy and Pikachu's feisty nature would make for some great adventures. They could both learn from each other's determination and loyalty to their friends. Another good pairing could be Sasuke and Charizard. Sasuke's brooding and powerful nature would match well with Charizard's strength and proud demeanor.
One really cool pairing could be Gaara and Golem. Gaara's connection to the earth and Golem's rock - based form would make them a strong team. They could both understand each other's strength and the importance of being a protector. And Hinata and Jigglypuff could be an adorable pairing. Hinata's shy nature and Jigglypuff's cute appearance would create some interesting interactions, and Hinata could learn some confidence from Jigglypuff's unwavering performance when it sings.