I like to believe that these 3 guys are slowly making their way around the various locations scattered across the media universe, leaving their essence behind as a "gift" (Biodome, Regular Show, Phineas & Ferb, Simpsons, Brawl in the Family, Alex Kidd, Mario Party, Pokemon, TF2, and others), and are currently in Kalos. They were killed (petrified) by Yoshi (in his metamorphosed form), by a hideously overpowered Psychic blast that managed to petrify the hero, Serena, Clemont, Bonnie, George the Blaziken, and the Mane 6 (sans Twilight, since she wasn't with them at the time) as well. Their spirits fled, wandering across Kalos, desperately seeking the resuscitating powers of Xerneas to essentially become immortal. A certain forest with their essence still in it can cause severe hallucinations to anyone who hasn't the proper protection, but that's for another time. When they were sneaking into a summer camp, they found some strange rings that, when worn, cause the wearer to shapeshift into any form they please. This ring is called Queen Chrysalis's Ring and has some of her power. They used the rings to shapeshift into the forms of Shauna, Trevor, and Tierno when at the campsite, and the leader used it again to shapeshift into an eccentric videographer who wanted everyone to mock Serena. This is the action that lead to the Trio's untimely demise, and someone came to Kalos from the Internet, found the spot where their petrified bodies stand today, and curiously felt them, thinking they were just statues. Little did he realize, this was prior to his 12th Boss Analysis video, and his curiosity led to him unwillingly making it about the very thing the Trio is associated with, and is in fact, their secret technique.