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Trade center
When collecting pokemon, the missing spots can be filled by trading.
What might you get by trading?
Please check this useful info.
Aim to be a famous trainer!
For completing the pokedex you have to get 150 pokemon.
That first requires both the Red and Green versions.
Then, you and your friends have to pick a different starter.
Having picked this, now decide which pokemon you will get.
Trade pokemon that can evolve before they evolve.
In total you need 3 playthroughs(If you're only 2 people, then one has to play twice).
Then you can get all starters.
The pokemon remember their owner?
The pokemon you caught and raised haver your name and Id.
Whoever gets the pokemon you traded over will see its original owner's name.
In other words, wherever it goes, anyone can know its your pokemon.
(this is everything but the square below, which made the post too long)