Deoxys, Pokémon #386 and star of the Upcoming Pokémon Movie. This Pokémon is also the ONLY Pokémon to Have Different Sprites throughout the Different games. Above is his Ruby/Sapphire sprite and here are the others:

Fire Red Leaf Green

So that proves Deoxys is a Shapeshifter, and he is found on Island 9 - Tri Island

 
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