You can find a Miracle Seed on Route 32.
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Try catch a Tropius, some of them hold miracle seed.
It boosts the power of grass-type moves
South of Violet City. There is a man standing in between some trees and a rock. He will not battle you, but if you talk to him he will give you the Miracle Seed.
You can find it on Route 32 after beating Falkner.
There is no best Pokemon on Pokemon HeartGold.