There isn't a Mount Freeze.
There are 4 well known Mountain Regions in Lethia.
Gaia's Heart, Burdan, Whispered Pass and Grim's Jaw.
Gaia's Heart is impossible to be on unless you can fly to it.
Why? Spoilers below for those who want to know.
Whispered Pass Is a rough terrain area that house both ground and rock pokemon. It's the largest mountain region in Lethia compared to Gaia's Heart and Grim's Jaw. There is nothing special here unless your character enjoys rock climbing.
Burdan is a very humid and hot area in Lethia containing a large range of fire pokemon from Magmar to Charmander. It is the most difficult place to locate food and best avoided unless you are willing to test your wits and go below where the heat rises.
Grim's Jaw is an Ice and snow region housing Ice and dark pokemon alike. It always snows in this mountain region, even in summer when the heat is at it's highest.
I agree with Logical Cabbage Gelius, you can't bunny other characters; IE control them unless you get permission from the character him/her self, Like I have with Demonic's Absol for the moment temporary.
On top of that, if you need to catch up or learn some of Lethia's Geography, please PM me so I can map out an area for you.