Sorry, but it isn't. If you were really desperate for one you could find it in Fire Red or Leaf Green (They're common in the Dilford Chamber, Liptoo Chamber, Monean Chamber, Rixy Chamber, Scufib Chamber, Viapolis Chamber and the Weepth Chamber). Then when you have caught it in that game you can trade it to your Emerald game.
BE WARNED: By trading a Pokemon from a separate game, it will add the whole pokedex, (as there is a different pokedex for each generation of game) so you will have tons of empty spaces on your Emerald game that you can only fill through trades. My advise: Don't bother, just go without on your emerald game and keep it in a Fire Red/Leaf Green game if you have one.
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Unknown are unavailable in Emerald. You must trade them from another game.
you carnt without cheating our hacking/codes
aipom's evole is a Pokemon from the next generation after emerald so its impossible to receive him.
In tall GrassYou can't get growlithe in emerald so trade one from firered or Pokemon xd.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.