Pikagender is a xenogender that is connected to the Pokémon Pikachu or a gender that is defined as "A gender that feels fuzzy with an electric charge".
Pikashinygender is a xenogender that is connected to the Shiny Pikachu, other terms for this gender include pikashinychugender, pikachushinygender, shinypikagender(chu) & shinypikachugender.
History
The term appears to have been coined sometime before January 27th, 2019 by tumblr user "chibiusapositivity".[1]
Flags
The original Pikagender flag was created by tumblr user "chibiusapositivity" when the term was coined.
The Pikashinygender flag was created by tumblr user "imoga-pride" on January 27th, 2019.[2]