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u can evolve remoraid via level up or catch one with super rod in pastoria city (about 40%)
There is no 'platnium', but you can find it on wild pokemon.
You can't find Registeel in Pokemon Platnium. You just migrate it in Pokemon Ruby, Pokemon Sapphire, and Pokemon Emerald.
Gamestop
Remoraid is a pokemon(water type)
in girantinas cave
in the trophey garden
Honey Trees
No, you'll have to trade it from Platnium. Which in Platnium you find it in the Rock Peak Ruins.
Trade from colloseum or island Five
Remoraid is a water type Pokemon
you cant that's a Pokemon move and Pokemon can learn it