PK6: Unobtainable Shiny Cosplay Pikachu .

In Pokemon Omega Ruby & Alpha Sapphire, players will receive a Cosplay Pikachu, after taking part in a Pokemon Contest Spectacular.
The Cosplay Pikachu comes with it's Hidden Ability Lightning Rod, and an exclusive move that changes with the costume.
Cosplay Pikachu normally cannot be obtained shiny in-game.

Through the power of hacking, theSLAYER obtained a few Cosplay Pikachu that are different from normal.
1. Shininess + Hidden Ability (Lightning Rod)
2. Shininess + Ability Slot 1 (Static)
[these were obtained by changing TID/SID of the Pokemon, to make it shiny. Also, ability changed for non-HA versions]

It's normally impossible to obtain more than one Cosplay Pikachu, and like Spiky-Eared Pikachu,
it cannot be traded (or deposited into Pokemon Bank), and cannot be transferred to future generations.

Pokémon Sun & Moon introduced a variant Pikachu that wear's Ash's Hat (Cap Pikachu) AND
Let's Go Pikachu introduced a variant that is your buddy (Partner Pikachu),
and it's interesting to note they removed shiny coloration for the alternate model that fills the shiny slot,
meaning that Cosplay Pikachu may be the last Pikachu Variant that have Shiny Models, even when shiny locked.