Yes, you can. Or, I think you can, but there are wild Tangela in HeartGold, and they evolve when they learn ancient power, around Lv30+
-Noah Garton, age 10
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Yes; Tangela evolves into Tangrowth by leveling up Tangela when it knows Ancient Power.
Froslass is from the ice gym, electivire is from electric gym, tangrowth and dusknoir are from trainers
Tangula Evolves into a Tangrowth
well i think you have to trade it from Pokemon peal or the esiet way to do it is migrate tangella him or her from Pokemon leafgreen then evolve him or her into a tangrowth done.
Pokemon #465 is Tangrowth