An1me freak here. I hope i can help. you know the little map that you can obtain on your poketech? he'll appear on that one. PS. when ever you go to a new route, he'll move so what i did wat go back and fourth until he was in the same patch of grass as me but use a Pokemon that has mean look or the ability arena trap. let me know if it helps or not...
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Go and talk to the owner of poketch in poketch company's building he will install the marking map app in your poketch
You can find articuno in the poketch marking app when he's all around
You have to go to Jublife City, into the Poketech building. Talk to the man in front of the counter, and he will give you the marking map.
how to get a togepi in Pokemon platinum
There is no grunt that you can give a Pokemon to in Pokemon platinum.