Generation Five has only been out for one year in total, so the earlier numbers on this list may not be especially rare compared to Pokémon that have been out of the rotation for some time. However, Virizion and Terrakion share the fifth and fourth places because of the circumstances of their Shiny release. The third part of their trio, Cobalion, saw a Shiny release at the exact time that the COVID-19 lockdown was beginning in America. As a response, Niantic canceled Lugia, which was set to take over raids after Cobalion, thereby extending Cobalion’s stay in raids and putting it as an encounter in GO Battle League. This meant that Shiny Cobalion could be caught from home. Not so for Virizion and Terrakion, which were released as restrictions were easing but not nearly as much as they currently have. This left many quarantining players with no chance of getting these, since this was after Legendaries had been removed from GO Battle League but before Remote Raid Invites were introduced.