you cant
Added September 13, 2011
Not true. You CAN have certain Pokemon walk with you in Hearthrome City park. You will find an item or two there. When you enter, the dude at the counter will tell you who is acceptable to walk with if you don't have the appropriate pokemon in your party at the time.
Chat with our AI personalities
to get Pokemon to like you you just train them and give them poffins and if they let you walk them in amity square
the cheat is walk anywhere or run anywhere
You cant walk on water but you can use surf. You get surf in celestic town.
NO The Pokewalker was made especially and only for SoulSilver and HeartGold, so the only way you could walk a Pokemon from your Platinum game is if you traded that Pokemon to SoulSilver\HeartGold and then transfer it onto the Pokewalker
you cant catch it anymore