There are no maps. It's a "mystery" dungeon. Ever notice how the layout changes every time?
There are 10 floors in Mt. Thunder, and 3 floors in Mt. Thunder Peak to get to Zapdos.
There are 10 floors to go through on Mt. Thunder. That take you to Mt. Thunder peak, which has 3 floors.
Zapdos
Rescue Jimpluff at Silent Chasm, and Zapdos will come and tell you to go to Mt. Thunder to battle him for Shiftry
Thunder Mountain, Mt. Mcginnis, Mt. Juneau, Mt. Jumbo... etc
Zapdos is in Mt. Thunder Peak. Moltres is in Mt. Blaze Peak. Articuno is in Frosty Grotto. To meet them again and recruit them, pass Mt. Thunder, Mt. Blaze, and Mt. Freeze without doing any rescue missions.
4 mountains Matterhorn Mt Space Mt Big Thunder Mt Splash Mt
It is 345 miles according to Google Maps.
Google maps
you can find zapdos in mt thunder
Aoraki..... often printed on modern maps as Aoraki/Mt Cook
It is 226 miles according to Google Maps.