all you have to do is get a pokemon who has surf,and surf around big oceans near cities.
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You can't find Vibrava on Pokémon Platinum
Tentacruel doesn't evolve, it is the final form of that pokemon. If you mean what level does Tentacool evole it is level 30.
To find a shiny stone in platinum you have to dig in the underground tunnel.
tenticool evolves into tentacruel
It's impossible to find Mewtwo in Platinum.