Depends on how it's received, really. And yeah, it isn't original, as it rips off the first movie. And, as Chapter 5 reveals, the HeartGold/SoulSilver games as well.
Oh, and this story and its sequel are troll fics. That explains a lot.
Oh, haha. Troll fics. That does explain a lot, but I'll say this (even though you probably know it): There are non-troll fics that are just as bad as this, in some cases worse.
Fortunately, it does have some moments of unintentional hilarity. Like the ever-shifting Eevee and "shut up or I EXPLODE YOUR HEAD". But mileage varies.