Therer isn't one for ruby,only for like Leafgreen an emerald
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first go to the safari zone and then look for PINSIR in the grass.It will take along time and if you are lucky you can catch him.I was walking around in the safari zone and a PINSIR suddenly appeared.
for Pokemon mystery dungeon explorers of time the code for unlimited pure seeds is 2229aef 00000001 1229aef2 00000001 1229aef4 0000005f
the previous answer to this question was complete twoddle. You CANNOT trade between generations. The closest thing you can get to trading between generations is the migration of Pokemon from generation 3 to 4. To get dratini in ruby version you have to trade it from leaf green or fire red. You can get dratini in fire red or leaf green by catching it in the safari zone or buying it at the game corner. Either way, it takes a lot of time and patience. I recommend the safari zone route.
you go to the safari park and on your bike you keep your finger on b until your bike starts to move up and down then you can find houndour however it takes a long time and also thnis way you can find milktank,gliger and stantler .
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