Originally Posted by RiotRunaan
Skins typically don't have canon lore, but there's a small "alternate universe" storyline for Pulsefire Ezreal. I posted this on the EU forums, so I'll give the same short summary of the idea here:
In my mind, a couple years from "now" in Runeterra, Ezreal's wanderlust leads him down into the Southern Wastes, where he stumbles into a time warp (rampant, chaotic magic down there and all). He emerges in the distant, war-torn future, where Piltovian and Zaunite technology has advanced far beyond anything he'd ever imagined--but has wrought utter destruction across Valoran. He finds the Pulsefire armor at a crash site, and discovers that it evolves to fit his form (and, of course, meets the AI named PEARL). Ezreal takes the Pulsefire armor back through the warp in the hopes of preventing such a future from ever happening, and... well, of course, to show off his totally superior technology to the rest of the League's champions. 'Cause he's Ezreal.
I actually made my own fanfic for this skin before i even heard about a lore for it. It's definitely not identical, but it is similar, as in he accidentally teleports to a wartorn future, however, demacia and noxus are at war, and Heimerdinger, after siding with demacia, came up with the pulsefire armor, while rumble helped noxian tech. There's also other different stuff. Still, cool skin, can't wait!