If you're talking about Twilight Princess then go to Karkiro Village. Go to the grave yard and find the small opening way in the back. Go in and talk to the Zora, he'll give you a lure. Go to Zora's Domain and fish in the backright (for wii, left for gamecube) corner. You'll catch a Reekfish. Smell it with wolf Link and save the scent. Go to Snowpeak and use your wolf senses. Follow the trail. Then talk Yeto on top of the hill (he'll do the rest.).
Now, if you're talking about Majora's Mask then I have no clue. I still haven't beaten that part.
by walking there
After you go through Snowpeak Ruins, Yeta looks into the mirror and is corrupted. She turns into Blizzeta: Twilt Ice Mass.
Snowpeak: Un nevadocima nevada
Go to Zora Domain and Exit to the Waterfall . Then go to a Mini Waterfall and You will See an Entrance where there will be two Zoras . Enter there and You Will See the Name Snowpeak Montains .
You catch the reekfish the you turn into the wolf smell it you follow the trail to get to the snowpeak temple
The Snowpeak Ruins, the Temple of Time and the City in the Sky
Ball & Chain.
In Arbiter's Grounds, but it is shattered and you have to get all the pieces which are in Snowpeak Ruins, The Temple of Time and The City in the Sky
Snowpeak (the entrance is in Zora's Domain).
Going through the story, you will encounter it in many places, most notably Snowpeak Temple.
you cant, you can only get him by trading all the regi Pokemon from ruby Sapphire or emerald onto diamond pearl or plantnum. hes located in the snowpeak temple.
the easy way is to go on to http://www.youtube.com/watch?v=MqRcE4xwDpY and there is a vidio on the temple at snowpeak ruins