its kind of easy but it takes a while ive been playing Pokemon platinum since mar. 22.2009 and i got my poke radar on nov.23.2009 and ive been using it for almost 3 months then i stopped and i was on my way to stark mt. to see if there was any items i missed and i got a Pokemon in the grass and it was a female raticate and it was shiny so if you try this it will most likely take a while until you get a shiny Pokemon without poke radar.
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you use the poke radar and max repels and you use poke radar and go to the closest rustling grass afterwords after about 64 Pokemon you should find a shiny
Use the poke radar and grass will spark yellow but if a shiny it will be blue.
Basically you can't, but you can get shiny's with the poke radar if you head to the shiny sections of grass. You can also get shinies in the wild if you reste the game until you find one!
poke radar tells you where different kinds of pokemin are hiding in the grass however more than less likely you can find a shiny bush of grash moving it can or cannot be a shiny Pokemon
At the trophy garden, rarely. it's in Pokemon platinum.