Yes ! it is true depending on the trainer's ability to use Pikachu effectively.
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catch pikachu in viridian forest and then use a thunderstone on it. same for firered and leaf green. ( kkrenzke says- ) they mean the legenday electric dog pokemon, your thinking of Raichu the evolved form of pickachu.
It's the same from Fire Red.It looks like you think that Pickachu appears Fire Red because they are very rare from Viridian Forest.You can find Pickachu easily at Power Plant near Route 10 and Rock Tunnel(Note that you need Surf to cross it).
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Psyduck is in firered not leafgreen you can find it using a good or super rod in the safari zone.
On Pokemon Pearl's title screen, if the Pokemon LeafGreen game is in the GBA slot, click on "Transfer From LeafGreen" and you can choose six Pokemon from LeafGreen to transfer to Pearl, but be careful-you can't trade them back.