No, some of the Pokemon you can only get on one game. On Pearl you can get Bonsly and Sudowoodo, but you can't get Stunky and Skuntank. For Diamond, it is the other way around. There are other Pokemon, but you need the PokeRadar to get them. I won't tell what they are because there is a lot of them and it says in all Diamond, Pearl, and Platinum guide books.:)
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there in the same place as Pokemon dimond
same thing
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
u might not like this answer, but sorry, you can't get turtwig in Pokemon emerald. turtwig was created in the newer games, like Pokemon diamond and pearl. but if u do get Pokemon diamond or pearl, u can choose turtwig, chimchar or piplup as your starter Pokemon. but in flora sky [same as emerald] there are turtwig, chimchar and piplup as your starter.
there is none. that is what i know from diamond. in pearl, its probably the same. - ho-ohawesomeness