When Tangela wants to learn Ancient power let it learn it, then level it up again and he/she will evolve into Tangrowth.
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tangela evolves when it learns the move ancient power then you get tangrowth... :D
It can evolve as early as Level 33 in Pokemon Diamond, Pearl, Platinum, HeartGold and SoulSilver but it needs to know the move AncientPower.
Tangela does not evolve in Fire Red.
tangela does not have an evolution
at level 100 I don't believe that. NO ONE evolves at level 100. Get Tangela to know the move 'Ancient Power' and level it up once. Then, you have a Tangrowth.