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Helioptile is 100% the worst shiny to hunt in the game. Drampa was easy compared to this stupid fucker. The runback you have to do for him to actually despawn and respawn is 58m. 70m away from the Helioptile to despawn him, and then to respawn him you have to get within 12m of him, because he's 38m away from the spawner (though thankfully that does spawn in the one a bit further up if the game decides those two are going to be the spots its going to populate, because you're only ~30m from it).
I wish this motherfucker was an extinct Pokemon so I could revive him at a fossil, the fossils were easier.