Digimon: Digital Monsters

Seven kids are transported to the Digital World, a strange place where digital creatures called "Digimon" reside. A group of Digimon soon befriend them and keep the kids out of harm's way. The children then discover they are the Chosen Children, which protect the Digital World from evil Digimon like Devimon and Vamdemon.

Pokémon

A young boy named Satoshi embarks on a journey to become a "Pokémon Master" with his first Pokémon, Pikachu. Joining him on his travels are Takeshi, a girl-obsessed Rock Pokemon Trainer, and Kasumi, a tomboyish Water Pokémon Trainer who may have a crush on him. Satoshi and Co. end up traveling through various regions, including Kanto, the Orange Islands, and Johto, and then enter the Pokémon League competitions there. Along the way, they run into many confrontations with Musashi, Kojirou, and Nyarth, a trio of Pokémon thieves who are apart of an evil organization called "Team Rocket". But everytime Team Rocket try to do their evil deeds, they fail thanks to Satoshi and his Pokémon. (Source: Anime News Network)

Yo-kai Watch

Animated adaptation of Level-5's Nintendo 3DS video game. While going deeper into the woods one day, primary school student Keita Amano ('Nate' in the English localisation) notices a bizarre capsule toy machine who tells him to insert money which he obeyingly does. But after opening the capsule that came out, a ghostly creature named Whisper materialises. Whisper, who was sealed inside the capsule, rewards his liberator Keita by becoming his Yo-kai butler and gives him a Yo-kai Watch. Whoever wears the watch gains the ability to see supernatural creatures called Yo-kai, each type possessing different kinds of magical abilities, and which are normally invisible to humans. The Yo-kai Watch also allows the wearer to summon any Yo-kai they have befriended, enabling the wearer to make use of the Yo-kai's powers. Using it, Keita and Whisper encounter many mischievous Yo-kai around town, resolving the trouble they're causing and befriending many at the same time.

Monster Rancher

Genki is a boy who loves playing video games. One day he's zapped into the world of Monster Rancher and meets the girl Holly and the monsters Mochi, Suezo, Golem, Tiger and Hare. Together, they are searching for a way to revive the Phoenix, which is the only monster capable of stopping the evil Moo. (Source: Anime News Network)