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DS can be found for dirt cheap on ebay, and you can buy pokemon games from the same place. I doubt the whole thing would set you back £50. If you could save a pound a day, you'd have it in 50 days or less.
If you can't save a pound a day, you need to sort out your budgeting. I'm a student too (with a summer job) and I can afford all sorts of luxarys because I budget everything.