go to the yellow trees that are spread out in the game and click a in front of the tree and it will say would you like to put honey on it and after a long time a Pokemon will appear on it
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Ice type pokemon.
you have a chance to get them when you use honey on honey trees.
I can't consider what route but if you look at your trainers case, then it says you have to go ti Pastoria. There are two different routes I believe to get there.
In Diamond,Pearl,and Platinum you have to slather honey on a tree. For heartgold and soulsilver you have to use headbutt on a tree.
Buy honey from Floarama and then when you see a brown tree, press A and apply the honey to the tree. Wait about 6 - 8 hours and when the tree is shaking it means theres a Pokemon there!