The pink Butterfree is the first alternately colored Pokémon in the anime. It was created before alternately colored Pokémon appeared in the games, possibly to differentiate it from the other Butterfree in the episode.

(Source: Bulbapedia)

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)

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The film's plot tells the story of how Satoshi (Ash) and Pikachu came to know each other. On the day they set out from Masara Town (Pallet Town), both of them saw a Ho-oh flying and made a vow to someday meet it. 

(Source: Anime News Network, edited)

After their encounter with Team Plasma, Satoshi, Iris and Dent start a new journey in the Decolore Islands.

Mezase Pokémon Master celebrates the final chapter in Satoshi and Pikachu's story, with their first companions and many Pokémon they have met throughout their journeys making their return.

Pink Butterfree