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You can catch Tangela at mt. coronet top if here is a Tangela swarm. You can go every day to your rivals sister and she says which swam there is that day. Or after beating the elite four and finishing the Sinnoh pokedex you can import it from other GameBoy Advance Pokemon games such as Emerald, LeafGreen, FireRed, etc. using Pal Park.
There is a map of Mt. Coronet in the Sinnoh region.
Mt coronet is only in diamond or pearl or platinum not in firered.
There is no Mt. Coronet in HeartGold as it does not take place in the Sinnoh region
mt coronet