From Bulbapedia, the community-driven Pokémon encyclopedia.
The pink Butterfree (Japanese: ピンクバタフリー pink Butterfree) is the first alternate colored Pokémon (excluding the ones being differently colored due to coloring errors) in the anime. It was created before alternate colored Pokémon appeared in the games, possibly to differentiate it from the other Butterfree in the episode. This may be why alternate colored Butterfree are not pink in the games.
History
She appeared in Bye-Bye Butterfree. Ash's Butterfree fell in love with her, and fought to save her from Team Rocket. At the end of the episode, the two became mates and Ash's Butterfree flew away across the ocean with the pink Butterfree.
The only other time the pink Butterfree was seen again was in the Japanese opening Spurt! and a flashback in the episode A Trainer and Child Reunion!, both along with Ash's Butterfree.
In the games
In Pokémon Gold, Silver, and Crystal a female NPC Cooltrainer near the top of the Lake of Rage makes a reference to a pink Butterfree after battling her. She comments, "Come to think of it, I've seen a pink Butterfree." This is likely to be a dual reference to a Butterfree's shiny form in the games, which does have pink coloring (but only on the wings and none on the body), due to the Trainer's pre-battle comment regarding the red Gyarados, as well as to the first known alternate-color Pokémon of the franchise.
Trivia
- Butterfree's coloration may not be naturally occurring; in In the Pink, an island is introduced where all of the Pokémon gradually turn pink as a result of eating a special berry only found on the island.
- It is also possible, if somewhat less likely due to the extremes of its coloration, that this particular Butterfree is from the Orange Islands, where many of the Pokémon seen there have strange coloration.
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