Ok you will need some things first. You need the amulet coin. Catch at least 40 species of Pokemon then travel to the house before the bike path (on the top). there will be an aide that will give you the amulet coin. Next you need to get to the sevvi islands. here is a tutorial to get there if you havnt already In firered how do you get to 4 island 5 island 6 island and 7 inland
Now go to five island and the the place labeled "Resort Gorgeous". there will be two "Lady" type trainers that will give you up to 20000 each if you use the amulet coin!
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...? umm this question doesnt make sense. you do it by seeing Pokemon! all the Pokemon in the game! (no trade)
I'm afraid that you cant make or get Pokéblocks on Leaf Green/Fire Red
mew-two is lvl. 70 in cerulian cave. make sure you save a masterball for him
If you have the Gameshark you can make the mod shop anywhere you want outside.
You must give to them pp up, carbos.iron and other things