>>58847796It's set up to give the player an opportunity to find it on their own initiative. Zapdos is available earliest, but it's way off the main path in an optional dungeon. Articuno is available only a little later, in a dungeon that is technically optional but much more obviously placed on the main path, though it's easy to completely miss it on your way through. And finally Moltres is available the latest but is the most obviously placed, being impossible to miss.