Yes; Tangela evolves into Tangrowth by leveling up Tangela when it knows Ancient Power.
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Teach it Ancient Power and level it up to level 33.
It can evolve as early as Level 33 in Pokemon Diamond, Pearl, Platinum, HeartGold and SoulSilver but it needs to know the move AncientPower.
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
Tangela does not evolve in Fire Red.
tangela does not have an evolution