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Cydewinder is the other half of the duo that created PokePlushies, and has his own set of adoptables much like Quetzal's Cylin. They are often given out in novel ways, which I'd attribute to boredom, genius or madness, but most likely a combination of the three. He is also more awesome than you. Accept it and move on.

Password Adoptables
Lousy Adoptable This adoptable was given to people who found a secret password by clicking on the supposed link to Cyde's minicity.
Glitch Saturday For one day only, this adoptable was distributed to people who found a secret password on infamous Glitch Saturday, January 12th.
Godzilla Yet another adoptable given to those who could find the proper password, which was later revealed to go with the "Dead Building" adoptable.
Dead Building This adoptable was released 10 days after Godzilla, completing the set.

Maze Adoptables
Left Kamehameha Piece Center Kamehameha Piece Right Kamehameha Piece
Theodore's Speech Bubble Theodore Theodore's Tail
These six adoptables were released in limited quantities into Theodore's Maze, which is no longer playable. On a grid of 100 X 100 feet, players would search the areas to find the adoptables. One adoptable was in the maze at any given time, and all were placed randomly.

Other Adoptables
Awesome Adoptable While leveling up adoptables, Cyde stumbled on a Mew and held a contest to give it away. All the runners-up got this adoptable as a consolation prize.
Code Breaker This adoptable was given to anyone who could break a code in the Codebreakers part of the PokePlushies forum.
The Plant The Plant is a growing adoptable available by finding a password. Every 50 levels, the plant grows into a new stage.