If you're in the middle of the game, then there's no point trying to get up them. The 8th gym badge will enable you to use the HM move, Waterfall, on the field. Then you can go back and collect all the goodies up the waterfalls.
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i dont have sapphire
As far as the game goes, you can't duplicate Pokemon on Sapphire. Tried it and it glitched up.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
Evee is not availiable in Pokemon Sapphire.
sinnoh Pokemon won't appear in Sapphire version!