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Just give me like a week or so and I will evolve the Scyther into Scizor and give it Superpower and Bullet Punch. You can have it for free if you are patient.
4th gen seeds are kind of limited, so you have to expand your search (increased delay range or max frame) in order to have a better chance of finding a seed.
Soul Silver is a 4th generation game, so you configure it in the 4th Generation Gae Config. It doesn't matter what type of DS you have. DS type only matters for 5th generation games.