Head to one island then use surf and go south you will reach treasure beach check the grass to find Tangela allthough of course it may not show up the first time so stick around. Also if you catch a venonat which can be captured at the safari zone you can trade it to a girl in the cinnibar island lab to get tangela named Crinkles.
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Only by trading it from Leafgreen/Firered.
tangela doesnt evolve in leaf green you have to transfer it to diamond and pearl in order to get tangrowth
You can find it from Great Marsh.
you get tangela in the great marsh in pastoria The easiest place to find it is Great Marsh Area 3/4 in the day or morning.
Piplup does not exist in Pokemon LeafGreen or FireRed.