the 493 heart scales have to be in a cheat.
1. find the pkm number on the national pokedex (eg. if you want bulbarsaur you want 1)
2. toss all but that many heart scale(for bulbasaur you would toss 492)
3.walk around in a place where wild Pokemon GO while holding down the L button
4.catch the Pokemon when they appear.
5. if you fail just keep on holding down the L button and you will face them again
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493 including mew deoxys arcues
Search Pokemon Modifier AR code for Pokemon Pearl on Google of Yahoo and read the description and add the code. I'll tell you the description anyway. Discard the amount of Masterball or Heart Scales so they equal 152 (493 - ? = 152 therefore you must discard 341 Masterballs/ Heart Scales). Then go into tall grass and hold l and walk around until you encounter Chikorita.
94000130 fdff0000 b21c4d28 00000000 b0000004 00000000 94000130 feff0000 00000890 01ed0001 d0000000 00000000 da000000 00000892 dc000000 00024620 c0000000 0000000b d7000000 00000000 dc000000 00000006 d2000000 00000000 Click L+R when you're in the game. You should have either 493 master balls or 493 heart scales. Find the number of the Pokemon you want (national pokedex). Take away items from 493 until you get your chosen number. Hold L while walking through grass and you should get that Pokemon.
the Pokemon # for arceus is 493
There is a patch for Pokemon Emerald with all the 1st, 2nd and 3rd pokemon. Nothing with all the 493 yet