If water got inside it... Turn it off. Remove the batteries and open it up as much as possible. Let it dry out in the sun or in a warm place till you are sure it's dry inside. Then try it.
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Wipe it off and lay it on a paper towel for awhile until it dries completely. If it actually got submerged it's probably ruined forever though.
Weirdly enough, close your DS and cover the broken button with your mouth and blow.. It will get it working. I dont know why this works (dust?) but it gets them working for a while.
If the pokewalker gets wet I will try and take the battery out and dry it as much as i can, I am not that positive it will still work but hopefully it will.
Get a new game. It might be buged up by cheat codes. Or mabe it was exsposed to magnetic,wet,or electrical objects.
To make a slide you need to gets 2 bubble essences.