Deoxys

Deoxys is a -typePokémon introduced in Generation III. It is also known as the 'DNA Pokémon'.

How to Obtain
Deoxys can be obtained by having both Solrock and Lunatone in your party and searching anywhere in Mysterious Grotto.

Deoxys can also be obtained from trading and the Pokémon Roulette.

''Note: You can have Solrock and Lunatone and have other pokemon in your party as well. It does not matter which order or where you put them in your party.''

Forms
Deoxys has 4 concurrent forms (Normal, Defense,  Attack,  Speed). You can change Deoxys forms by going to finding meteorites found in Mysterious Grotto. Each form has increment and decrement in particular status, corresponding to their name.