You can't catch a Pineco in Saphire if you don't have the National Pokedex. Otherwise, you will have to trade for one.
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No. You have to trade from either Sapphire or Ruby.
If you mean where do i catch a pineco in fire red, go to pattern bush i think.
How do you catch latios in Pokemon sapphire
After national dex you find it at altering cave its Levels: 20 +
There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.