There is no Ancient Power TM in Pokemon Platinum, It can only be taught by leveling up, Move tutoring or by learning it from a Pokemon from an egg.
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its a move your Pokemon might learn
There are two pokemons that have this move: Togepi and giratina.
tangela evolves when it learns the move ancient power then you get tangrowth... :D
You get a tangela to level 33 and teach it ancient power (which it learns at lvl 33)
Heal Block, Roar of time, Ancient power and Dragon claw.