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(Train till level 60 above,sure can one)
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To complete the storyline you have to beat the Elite 4 To really beat the game you have to defeat Red on Mt.Silver To become a Pokemon master though, you have to catch all 251 Pokemon available in Crystal version
You get it after you beat the elite 4.
Well,Level 70-100 Is A Good Level To Beat The Elite 4.
after you beat the elite 4
No but you can catch many of the Pokemon in Sinnoh after you beat the Elite 4