You can only catch Phanpy in Platinum if it's 1 of the daily swarms but swarms do not occur until after beating the Elite 4 and acquiring the National Dex however you could also migrate it from either Ruby, Sapphire, FireRed, LeafGreen or Emerald or you could trade for it.
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The easiest way to get Phanpy is to migrate from Pokemon emerald or ruby :D
If you DS clock says it is Friday, then go to the Valley Windworks, and the drifloon will be in front of the building.
Heatran is a ledgendary in Pokemon platinum.
There is not a route 233 on Pokemon platinum.
The routes in Pokemon Platinum begin in the 200s.