Train it to level 100...Or get the TRU(Toys 'R' Us) event Shaymin, which has said move already in its moveset.
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It learns seed flare at level 100 . Hope this helped!
leval 100
shymin is because he has seed flare
for diamond it knows Substitute, Aromaterapy, Energy Ball, and Seed Flare.
Yes, Seed Flare is a VERY good move. It has a natural 40% chance of lowering the foes Sp. Defense 2 Levels. (Effectively halving it) This is even better when Shaymin is in Sky Forme, because of Serene Grace (Shaymin Sky Forme's ability) this % doubles to 80% chance. This basically guarantees a Sp. Defense drop. Not to mention the Base Power! (120)