You press the pause button
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Everything is just completely random it takes a few battles then you go to the Pokemon list in the pause screen then take its item.
Go to the pause menu thing then press 'P' or 'Pause Game' XP
Yes! Get a link compatible emulator, open 2 of it in windows, In settings turn off "pause inactive windows" then, walk both of the games to the Pokemon center and it should show up as linked when you walk to the union room, or whatever it is called!
Normally the Start button will pause a game, but the console can be closed, which will put it into sleep mode and pause the game.
Pressing the + button on the Wii-Remote will pause the game, and will let you un-pause or return to the Comet Observatory.