flamethrower, fire blast, blast burn, and brick break
Seven Island if you don't include the elite four.
Use a combination of different type attacks, for example: --Hyper Beam --Ice Beam --Thunderbolt --Fire Blast
Groudon, Kyogre, Mewtwo, Ho-oh, Lugia, Zapdos.
you know in every Pokemon game . THE ELITE FOUR!
The best way to trade i guess wuld be to 'MIGRATE' from LeafGreen, in Pal Park to do this you need to beat the elite four and get the national pokedex
The best water type would be Kyogre but you can't get it in leafgreen you need to get one from sapphire or emerald other than that the best water Pokemon is blastoise.
Venusaur,Rapidash,Gyarados,Pikachu,Pidgeot and Dragonite
sludge bomb,earthquake,petal dance,solarbeam
well...i don't know about the best attacks, but if it helps, my raichu knows strength, thunder, thunderbolt, and shockwave.(the move maniac on 2 island teaches shockwave-have 2 tinymushrooms or 1 bigmushroom handy.they're found as a paras's hold item in the safari zone.)
dragonite is the strongest dragon there is in leafgreen
The best way is challenge the elite four with your Pokemon or a Pokemon holding exp. share. The better is to use gameshark codes for rare candies.
well for me get all three kanto starters a pidgeot a dragonite and golem hope this helps