Seed Flare must be a gen. 5 move...
Solar beam 2 turn and vulnerable unless it's sunny... Awesome in gen 1 and 2 though.
Seed Flare is a Gen 4 move ..... Shaymin's signature move. 120 base power and a 40% chance to lower the foe's SpDef by 2. That's very good even with 85 accuracy.
Under the sun, SolarBeam is incredibly powerful. Just saying.